⍝ Shannon-Fano packing:

    packS'Mississippi'              ⍝ Shannon-Fano packing.
┌──┬────┬───────┬───────────────────────────────────────────────────────────┐
│11│ispM│1 2 3 3│0 1 0 1 1 0 1 1 1 1 1 1 0 1 0 1 0 0 1 0 1 0 0 1 1 0 1 1 0 0│
└──┴────┴───────┴───────────────────────────────────────────────────────────┘

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

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

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