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Yeah I think we can shred a couple of characters using this technique from your code as well - it will become 71 characters, best so far:

f i=1:1:N f j="",1:1:i,i-1:-1:1 w !?N-j f l=1:1:j{w l} f r=l-1:-1:1 w r

Yeah I thought N>9 is "bonus level" - it will definitely require more characters. Original answer (top one) was only working for N<=9 anyway

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