I feel it hard to give an accurate title, though I have tried my best. Here's my problem.I would like to get a vector e, such that e consists of the product calculated from the combinations of values chosen from a, b, c and d.

## Is java.util.Random really that random? How can I generate 52! (factorial) possible sequences?

I've been using Random (java.util.Random) to shuffle a deck of 52 cards. There are 52! (8.0658175e+67) possibilities. Yet, I've found out that the seed for java.util.Random is a long, which is much smaller at 2^64 (1.8446744e+19).

## All possible subdivisions of a list

I've just written a small recursive programme to generate all the possible subdivisions of a list:I've brute forced this and it's taken me a long time to figure out. I'm wondering what this is called, as I'm sure there is a name for it.

## Permutation mapping of two lists in python

How can I create a permutation mapping of two lists in python?For example I have two lists [1,2,3] and ['A','B','C']

## Find strings that contain a sequence of characters regardless of the order in r

I have a dataframe(df)I want to find all the strings that contain a certain sequence of characters, regardless of the order. For example if I have the string "CBC" or "CCB" I would like to get