Find a combinatorial algorithm Demo, to find the unique combinatorial result.

I have an one-dimensional array, which contains the letter Amurz. If you want to find out all the unique combinations, the combination type is 1-to-many, for example: the letter A can be combined with any other one or more letters, please give a Demo or explain the principle thank you, it can be the implementation of any programming language, JS is the best.

except for addition operations.

Javascript php node.js cPP c

Mar.16,2021

first of all, determine whether the order is inconsistent with the same combination or different combinations such as ABCD and DBCA, ACBD, etc. If it is the same combination, the result will be a little less

yours is nothing more than enumeration, as for the so-called addition operation, do not understand, since it is one-to-many, two for loops?

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