Solution by Ruben Westerberg

ch-1.pl and ch-1.raku
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Flip binary
Run program to find largest number of 1's in binary number, after a select sub set has been flipped. Accepts 1 optional argument, which is is the number of digits in the (random) number to test.
3 is the default


ch-2.pl and ch-2.raku
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Computes all the wave arrays for a given integer array. Accepts a single arbument which is the size of the array. Default is 4