⍝ Huffman packing:

    packH'Mississippi'                  ⍝ Huffman packing.
┌──┬────┬───────┬─────────────────────────────────────────┐
│11│sMpi│1 3 3 2│1 0 0 1 1 0 0 1 1 0 0 1 1 1 0 1 1 0 1 1 1│
└──┴────┴───────┴─────────────────────────────────────────┘

    chk←{
        ⍵≡0 ⍺⍺ ⍺⍺ ⍵:'ok'
        ' Error: compression round-trip fails'
    }

    packH chk ⎕fmt notes.Marilyn        ⍝ simple text matrix
ok

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