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  1. or download this
    combos n ls = filter ((>= n) . length)
            . map concat
            . sequence
            . map (([]:) . map return)
            $ ls
  2. or download this
    > combos 1 ["abc", "def"]
["d","e","f","a","ad","ae","af","b","bd","be","bf","c","cd","ce","cf"]
  3. or download this
    > combos 4 ["abc", "de", "fgh", "i", "jk", "l", "m"]
["ijlm","iklm","fjlm","fklm","film","fijm", ...
 "cehijlm","cehik","cehikm","cehikl","cehiklm"]