Given n as input Draw a 'X' in a n-by-n matrix.
y=[1 0 1
0 1 0
1 0 1]
y=[1 0 0 1
0 1 1 0
0 1 1 0
1 0 0 1]
Make one big string out of two smaller strings
Compute a dot product of two vectors x and y
Create a vector whose elements depend on the previous element
Flip the vector from right to left
Find all repeated numbers
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