creates a list of lists where each list element has n elements 1 element from each of the first n lists
an integer less than or equal to the number of lists used to choose from which specifies the length of each combination elements from the list choices
a list of lists where one element at a time will be combined with elements of the other list
this is a helper function and not necessary for the regular user
returns the list of lists for possible combinations of 1 element at a time from each list
The global variable V is used to return the list and thus V should not be used for any other variable name. This may need to be corrected in future versions
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