Accessing parts of a long matrix

i have a matrix as shown in figure.here there are three cells which increase diagonally.in this example thr are3.there will be more as matrix size increses.this is basically machine part matrix.the rows are givig info abt machine number and columns are part number.the parts are to be processed on a machine.the ones with in the cells is representing a machine operation on a part.if u look at first cell,it has 2 machines(2,4) and 2 parts(1,5).part 1 has total 2 operations.one on machine 2 and one on machine 5.my job is to find out which operation is inside the cell and which is outside it.I have replaced the ones with no. of operations.like part 1 first operation is on machine 2 and 2nd on 4.only in this figure there is no one outside.but if part 3 has some operation on machine 1.it will be 3rd operation and it will be outisde cell 1.and that i have to check.which part operation is outside the cell.i hope it some what clear now