add enumerating all submasks #29
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Title: Implemented Bitwise Fast Enumeration of submasks
Description:
I've implemented a fast enumeration method for all submasks by taking advantage of bit properties.
Example:$\in$ {13 (1101), 12 (1100), 9 (1001), 8 (1000), 5 (101), 4 (100), 1}
n = 13 (1101)
s