on generating combinations among a variable list of lists
Say we have [1,3,5,7], [2,3], [1,10]. I'd like to generate
The number of input lists is variable. The example shows three lists,
but there could be only one or ten lists or any other number of lists.
I looked at itertools. There doesn't seem to be any procedure ready for
this. I might have to combine some of them but I'm not yet sure how.