We are given n by n boolean matrix ( n <= 20). Output of matrix should
be such that every row and every column should have only one true
value ( true=1, false=0). Input matrix can have any number of 1's and
there will be no row or column having all zero values. Example: let
n=4

Input Matrix:
1 0 1 1
0 1 0 1
0 1 1 0
1 0 0 1

Final Matrix could have many correct answers. One of them is:
1 0 0 0
0 1 0 0
0 0 1 0
0 0 0 1

We've to find out the number of ways to get the desiered output.

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