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When using key ⌸ to produce a frequency table, e.g
{⍺,≢⍵}⌸'mississippi'
┌→──┐
↓m 1│
│i 4│
│s 4│
│p 2│
└+──┘
I frequently find myself wanting to 'seed' the result set to provide a count of 0 for any items I know to be missing. If we're doing a letter frequency distribution analysis we might...