Microsoft Excel - Find all occuring combinations of 5 characters out of a list of 6 characters separated by commas

Question

I have a list of items of 6 characters each. For example, all 6 character combinations of alphabets a,b,c,d,e,f,g,h as below.

a,b,c,d,e,f a,b,c,d,e,g a,b,c,d,e,h a,b,