Given x as input, generate a x-by-x matrix 'C' using 0 and 1.
[0 1 1 1
1 0 0 0
1 0 0 0
0 1 1 1]
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Find the longest sequence of 1's in a binary sequence.
Swap the first and last columns
Multiples of a Number in a Given Range
Sum of Two Numbers
Prime numbers between a , b.
Draw 'O' !
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