{"group":{"id":1,"name":"Community","lockable":false,"created_at":"2012-01-18T18:02:15.000Z","updated_at":"2025-12-14T01:33:56.000Z","description":"Problems submitted by members of the MATLAB Central community.","is_default":true,"created_by":161519,"badge_id":null,"featured":false,"trending":false,"solution_count_in_trending_period":0,"trending_last_calculated":"2025-12-14T00:00:00.000Z","image_id":null,"published":true,"community_created":false,"status_id":2,"is_default_group_for_player":false,"deleted_by":null,"deleted_at":null,"restored_by":null,"restored_at":null,"description_opc":null,"description_html":null,"published_at":null},"problems":[{"id":2252,"title":"Create matrix with common dates from a number of structs -inner join on dates","description":"Do an \"inner join\" (as in SQL) on a number of structs where the \".date\" is the date and the \".ts\" the timeseries. The join is on common dates and the result is a matrix which has as first column the common dates and the following columns are the data points from the matrices. For example n=2\r\n\r\n  X(1).date=[73502 73503 73504 73505 73506 73507];\r\n  X(1).ts=[100 101 102 102 101 100];\r\n  \r\n  X(2).date=[73503 73504 73506 73507 73508];\r\n  X(2).ts=[101 99 100 98 99];\r\n\r\nResulting into a matrix with n+1 columns\r\n\r\n  Y=[73503 101 101;\r\n     73504 102 99;\r\n     73506 101 100;\r\n     73507 100 98]\r\n\r\nThe number n is the number of datasets X(1) ... X(n)\r\n\r\n\r\n\r\n","description_html":"\u003cp\u003eDo an \"inner join\" (as in SQL) on a number of structs where the \".date\" is the date and the \".ts\" the timeseries. The join is on common dates and the result is a matrix which has as first column the common dates and the following columns are the data points from the matrices. For example n=2\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eX(1).date=[73502 73503 73504 73505 73506 73507];\r\nX(1).ts=[100 101 102 102 101 100];\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eX(2).date=[73503 73504 73506 73507 73508];\r\nX(2).ts=[101 99 100 98 99];\r\n\u003c/pre\u003e\u003cp\u003eResulting into a matrix with n+1 columns\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eY=[73503 101 101;\r\n   73504 102 99;\r\n   73506 101 100;\r\n   73507 100 98]\r\n\u003c/pre\u003e\u003cp\u003eThe number n is the number of datasets X(1) ... X(n)\u003c/p\u003e","function_template":"function Y = your_fcn_name(X)\r\n  Y = X;\r\nend","test_suite":"%%\r\nX(1).date=[73502 73503 73504 73505 73506 73507]; X(1).ts=[100 101 102 102 101 100];\r\nX(2).date=[73503 73504 73506 73507 73508]; X(2).ts=[101 99 100 98 99];\r\ny_correct = [73503 101 101; 73504 102 99; 73506 101 100; 73507 100 98];\r\nassert(isequal(your_fcn_name(X),y_correct))\r\n%%\r\nX(1).date=[73502 73503 73504 73505 73506 73507]; X(1).ts=[100 101 102 102 101 100];\r\nX(2).date=[73503 73504 73506 73507 73508]; X(2).ts=[101 99 100 98 99];\r\nX(3).date=[73502 73504 73505 73506 73507]; X(3).ts=[100 102 102 101 100];\r\ny_correct = [73504 102 99 102; 73506 101 100 101; 73507 100 98 100];\r\nassert(isequal(your_fcn_name(X),y_correct))\r\n%%\r\nX(1).date=[73502 73503 73504 73505 73506 73507]; X(1).ts=[100 101 102 102 101 100];\r\nX(2).date=[73503 73504 73506 73507 73508]; X(2).ts=[101 99 100 98 99];\r\nX(3).date=[73502 73504 73505 73506 73507]; X(3).ts=[100 102 102 101 100];\r\nX(4).date=[73502 73504 73505 73506]; X(4).ts=[100 102 102 101];\r\ny_correct = [73504 102 99 102 102; 73506 101 100 101 101];\r\nassert(isequal(your_fcn_name(X),y_correct))","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":13576,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":15,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2014-03-19T12:57:14.000Z","updated_at":"2014-03-20T14:42:20.000Z","published_at":"2014-03-19T15:53:20.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eDo an \\\"inner join\\\" (as in SQL) on a number of structs where the \\\".date\\\" is the date and the \\\".ts\\\" the timeseries. The join is on common dates and the result is a matrix which has as first column the common dates and the following columns are the data points from the matrices. For example n=2\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[X(1).date=[73502 73503 73504 73505 73506 73507];\\nX(1).ts=[100 101 102 102 101 100];\\n\\nX(2).date=[73503 73504 73506 73507 73508];\\nX(2).ts=[101 99 100 98 99];]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eResulting into a matrix with n+1 columns\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[Y=[73503 101 101;\\n   73504 102 99;\\n   73506 101 100;\\n   73507 100 98]]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe number n is the number of datasets X(1) ... X(n)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"problem_search":{"errors":[],"problems":[{"id":2252,"title":"Create matrix with common dates from a number of structs -inner join on dates","description":"Do an \"inner join\" (as in SQL) on a number of structs where the \".date\" is the date and the \".ts\" the timeseries. The join is on common dates and the result is a matrix which has as first column the common dates and the following columns are the data points from the matrices. For example n=2\r\n\r\n  X(1).date=[73502 73503 73504 73505 73506 73507];\r\n  X(1).ts=[100 101 102 102 101 100];\r\n  \r\n  X(2).date=[73503 73504 73506 73507 73508];\r\n  X(2).ts=[101 99 100 98 99];\r\n\r\nResulting into a matrix with n+1 columns\r\n\r\n  Y=[73503 101 101;\r\n     73504 102 99;\r\n     73506 101 100;\r\n     73507 100 98]\r\n\r\nThe number n is the number of datasets X(1) ... X(n)\r\n\r\n\r\n\r\n","description_html":"\u003cp\u003eDo an \"inner join\" (as in SQL) on a number of structs where the \".date\" is the date and the \".ts\" the timeseries. The join is on common dates and the result is a matrix which has as first column the common dates and the following columns are the data points from the matrices. For example n=2\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eX(1).date=[73502 73503 73504 73505 73506 73507];\r\nX(1).ts=[100 101 102 102 101 100];\r\n\u003c/pre\u003e\u003cpre class=\"language-matlab\"\u003eX(2).date=[73503 73504 73506 73507 73508];\r\nX(2).ts=[101 99 100 98 99];\r\n\u003c/pre\u003e\u003cp\u003eResulting into a matrix with n+1 columns\u003c/p\u003e\u003cpre class=\"language-matlab\"\u003eY=[73503 101 101;\r\n   73504 102 99;\r\n   73506 101 100;\r\n   73507 100 98]\r\n\u003c/pre\u003e\u003cp\u003eThe number n is the number of datasets X(1) ... X(n)\u003c/p\u003e","function_template":"function Y = your_fcn_name(X)\r\n  Y = X;\r\nend","test_suite":"%%\r\nX(1).date=[73502 73503 73504 73505 73506 73507]; X(1).ts=[100 101 102 102 101 100];\r\nX(2).date=[73503 73504 73506 73507 73508]; X(2).ts=[101 99 100 98 99];\r\ny_correct = [73503 101 101; 73504 102 99; 73506 101 100; 73507 100 98];\r\nassert(isequal(your_fcn_name(X),y_correct))\r\n%%\r\nX(1).date=[73502 73503 73504 73505 73506 73507]; X(1).ts=[100 101 102 102 101 100];\r\nX(2).date=[73503 73504 73506 73507 73508]; X(2).ts=[101 99 100 98 99];\r\nX(3).date=[73502 73504 73505 73506 73507]; X(3).ts=[100 102 102 101 100];\r\ny_correct = [73504 102 99 102; 73506 101 100 101; 73507 100 98 100];\r\nassert(isequal(your_fcn_name(X),y_correct))\r\n%%\r\nX(1).date=[73502 73503 73504 73505 73506 73507]; X(1).ts=[100 101 102 102 101 100];\r\nX(2).date=[73503 73504 73506 73507 73508]; X(2).ts=[101 99 100 98 99];\r\nX(3).date=[73502 73504 73505 73506 73507]; X(3).ts=[100 102 102 101 100];\r\nX(4).date=[73502 73504 73505 73506]; X(4).ts=[100 102 102 101];\r\ny_correct = [73504 102 99 102 102; 73506 101 100 101 101];\r\nassert(isequal(your_fcn_name(X),y_correct))","published":true,"deleted":false,"likes_count":1,"comments_count":0,"created_by":13576,"edited_by":null,"edited_at":null,"deleted_by":null,"deleted_at":null,"solvers_count":15,"test_suite_updated_at":null,"rescore_all_solutions":false,"group_id":1,"created_at":"2014-03-19T12:57:14.000Z","updated_at":"2014-03-20T14:42:20.000Z","published_at":"2014-03-19T15:53:20.000Z","restored_at":null,"restored_by":null,"spam":false,"simulink":false,"admin_reviewed":false,"description_opc":"{\"relationships\":[{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/document\",\"targetMode\":\"\",\"relationshipId\":\"rId1\",\"target\":\"/matlab/document.xml\"},{\"relationshipType\":\"http://schemas.mathworks.com/matlab/code/2013/relationships/output\",\"targetMode\":\"\",\"relationshipId\":\"rId2\",\"target\":\"/matlab/output.xml\"}],\"parts\":[{\"partUri\":\"/matlab/document.xml\",\"relationship\":[],\"contentType\":\"application/vnd.mathworks.matlab.code.document+xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\"?\u003e\\n\u003cw:document xmlns:w=\\\"http://schemas.openxmlformats.org/wordprocessingml/2006/main\\\"\u003e\u003cw:body\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eDo an \\\"inner join\\\" (as in SQL) on a number of structs where the \\\".date\\\" is the date and the \\\".ts\\\" the timeseries. The join is on common dates and the result is a matrix which has as first column the common dates and the following columns are the data points from the matrices. For example n=2\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[X(1).date=[73502 73503 73504 73505 73506 73507];\\nX(1).ts=[100 101 102 102 101 100];\\n\\nX(2).date=[73503 73504 73506 73507 73508];\\nX(2).ts=[101 99 100 98 99];]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eResulting into a matrix with n+1 columns\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"code\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003e\u003c![CDATA[Y=[73503 101 101;\\n   73504 102 99;\\n   73506 101 100;\\n   73507 100 98]]]\u003e\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003cw:p\u003e\u003cw:pPr\u003e\u003cw:pStyle w:val=\\\"text\\\"/\u003e\u003c/w:pPr\u003e\u003cw:r\u003e\u003cw:t\u003eThe number n is the number of datasets X(1) ... X(n)\u003c/w:t\u003e\u003c/w:r\u003e\u003c/w:p\u003e\u003c/w:body\u003e\u003c/w:document\u003e\"},{\"partUri\":\"/matlab/output.xml\",\"contentType\":\"text/xml\",\"content\":\"\u003c?xml version=\\\"1.0\\\" encoding=\\\"UTF-8\\\" standalone=\\\"no\\\" ?\u003e\u003cembeddedOutputs\u003e\u003cmetaData\u003e\u003cevaluationState\u003emanual\u003c/evaluationState\u003e\u003clayoutState\u003ecode\u003c/layoutState\u003e\u003coutputStatus\u003eready\u003c/outputStatus\u003e\u003c/metaData\u003e\u003coutputArray type=\\\"array\\\"/\u003e\u003cregionArray type=\\\"array\\\"/\u003e\u003c/embeddedOutputs\u003e\"}]}"}],"term":"tag:\"inner join\"","current_player_id":null,"fields":[{"name":"page","type":"integer","callback":null,"default":1,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":null,"prepend":true},{"name":"per_page","type":"integer","callback":null,"default":50,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":null,"prepend":true},{"name":"sort","type":"string","callback":null,"default":null,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":null,"prepend":true},{"name":"body","type":"text","callback":null,"default":"*:*","directive":null,"facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":false},{"name":"group","type":"string","callback":null,"default":null,"directive":"group","facet":true,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"difficulty_rating_bin","type":"string","callback":null,"default":null,"directive":"difficulty_rating_bin","facet":true,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"id","type":"integer","callback":null,"default":null,"directive":"id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"tag","type":"string","callback":null,"default":null,"directive":"tag","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"product","type":"string","callback":null,"default":null,"directive":"product","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"created_at","type":"timeframe","callback":{},"default":null,"directive":"created_at","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"profile_id","type":"integer","callback":null,"default":null,"directive":"author_id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"created_by","type":"string","callback":null,"default":null,"directive":"author","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"player_id","type":"integer","callback":null,"default":null,"directive":"solver_id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"player","type":"string","callback":null,"default":null,"directive":"solver","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"solvers_count","type":"integer","callback":null,"default":null,"directive":"solvers_count","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"comments_count","type":"integer","callback":null,"default":null,"directive":"comments_count","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"likes_count","type":"integer","callback":null,"default":null,"directive":"likes_count","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"leader_id","type":"integer","callback":null,"default":null,"directive":"leader_id","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true},{"name":"leading_solution","type":"integer","callback":null,"default":null,"directive":"leading_solution","facet":null,"facet_method":"and","operator":null,"param":"term","static":null,"prepend":true}],"filters":[{"name":"asset_type","type":"string","callback":null,"default":null,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":null,"static":"\"cody:problem\"","prepend":true},{"name":"profile_id","type":"integer","callback":{},"default":null,"directive":null,"facet":null,"facet_method":"and","operator":null,"param":"author_id","static":null,"prepend":true}],"query":{"params":{"per_page":50,"term":"tag:\"inner join\"","current_player":null,"sort":"map(difficulty_value,0,0,999) asc"},"parser":"MathWorks::Search::Solr::QueryParser","directives":{"term":{"directives":{"tag":[["tag:\"inner join\"","","\"","inner join","\""]]}}},"facets":{"#\u003cMathWorks::Search::Field:0x00007f74d8dc8fd0\u003e":null,"#\u003cMathWorks::Search::Field:0x00007f74d8dc8f30\u003e":null},"filters":{"#\u003cMathWorks::Search::Field:0x00007f74d8dc8670\u003e":"\"cody:problem\""},"fields":{"#\u003cMathWorks::Search::Field:0x00007f74d8dc9250\u003e":1,"#\u003cMathWorks::Search::Field:0x00007f74d8dc91b0\u003e":50,"#\u003cMathWorks::Search::Field:0x00007f74d8dc9110\u003e":"map(difficulty_value,0,0,999) asc","#\u003cMathWorks::Search::Field:0x00007f74d8dc9070\u003e":"tag:\"inner join\""},"user_query":{"#\u003cMathWorks::Search::Field:0x00007f74d8dc9070\u003e":"tag:\"inner join\""},"queried_facets":{}},"query_backend":{"connection":{"configuration":{"index_url":"http://index-op-v2/solr/","query_url":"http://search-op-v2/solr/","direct_access_index_urls":["http://index-op-v2/solr/"],"direct_access_query_urls":["http://search-op-v2/solr/"],"timeout":10,"vhost":"search","exchange":"search.topic","heartbeat":30,"pre_index_mode":false,"host":"rabbitmq-eks","port":5672,"username":"search","password":"J3bGPZzQ7asjJcCk","virtual_host":"search","indexer":"amqp","http_logging":"true","core":"cody"},"query_connection":{"uri":"http://search-op-v2/solr/cody/","proxy":null,"connection":{"parallel_manager":null,"headers":{"User-Agent":"Faraday v1.0.1"},"params":{},"options":{"params_encoder":"Faraday::FlatParamsEncoder","proxy":null,"bind":null,"timeout":null,"open_timeout":null,"read_timeout":null,"write_timeout":null,"boundary":null,"oauth":null,"context":null,"on_data":null},"ssl":{"verify":true,"ca_file":null,"ca_path":null,"verify_mode":null,"cert_store":null,"client_cert":null,"client_key":null,"certificate":null,"private_key":null,"verify_depth":null,"version":null,"min_version":null,"max_version":null},"default_parallel_manager":null,"builder":{"adapter":{"name":"Faraday::Adapter::NetHttp","args":[],"block":null},"handlers":[{"name":"Faraday::Response::RaiseError","args":[],"block":null}],"app":{"app":{"ssl_cert_store":{"verify_callback":null,"error":null,"error_string":null,"chain":null,"time":null},"app":{},"connection_options":{},"config_block":null}}},"url_prefix":"http://search-op-v2/solr/cody/","manual_proxy":false,"proxy":null},"update_format":"RSolr::JSON::Generator","update_path":"update","options":{"url":"http://search-op-v2/solr/cody"}}},"query":{"params":{"per_page":50,"term":"tag:\"inner join\"","current_player":null,"sort":"map(difficulty_value,0,0,999) asc"},"parser":"MathWorks::Search::Solr::QueryParser","directives":{"term":{"directives":{"tag":[["tag:\"inner join\"","","\"","inner join","\""]]}}},"facets":{"#\u003cMathWorks::Search::Field:0x00007f74d8dc8fd0\u003e":null,"#\u003cMathWorks::Search::Field:0x00007f74d8dc8f30\u003e":null},"filters":{"#\u003cMathWorks::Search::Field:0x00007f74d8dc8670\u003e":"\"cody:problem\""},"fields":{"#\u003cMathWorks::Search::Field:0x00007f74d8dc9250\u003e":1,"#\u003cMathWorks::Search::Field:0x00007f74d8dc91b0\u003e":50,"#\u003cMathWorks::Search::Field:0x00007f74d8dc9110\u003e":"map(difficulty_value,0,0,999) asc","#\u003cMathWorks::Search::Field:0x00007f74d8dc9070\u003e":"tag:\"inner join\""},"user_query":{"#\u003cMathWorks::Search::Field:0x00007f74d8dc9070\u003e":"tag:\"inner join\""},"queried_facets":{}},"options":{"fields":["id","difficulty_rating"]},"join":" "},"results":[{"id":2252,"difficulty_rating":"easy-medium"}]}}