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*** Combinations of 4 items in a group of 10

There are  210  (red tile position 10 - 4) different combinations (whe
+n the order does not matter) of 4 items in a group of 10.
There are  715  (green tile) different combinations with repetitions o
+f 4 items in group of 10.

This is called combination (or k-combination) in mathematic, id est no
+ matter of the order of the elements and no repetition of elements.
The formula is the binomial coefiicent one.
...
 C(n,k) =  ----------
            k!(n-k)!

perl -E "say @$_ for grep{$$_[0]!=$$_[1] and $$_[0]!=$$_[2] and $$_[0]
+!=$$_[3] and $$_[1]!=$$_[2]
 and $$_[1]!=$$_[3] and $$_[2]!=$$_[3]} map { [split '',sprintf '%04s'
+,$_]} 0..9999;"