Monster function
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I just started working on some bugs inside a true monster: 700 lines, no subroutines, variables appropriately named data01, data02... about 15 or so keywords. (It was written by a student, but it is used fairly often). I have been able to look at and understand only a small fraction of it, but near the end I found this:
for xx=0, n-1 do begin
if n ge xx+1 then begin
; about 70 lines- The last 30 only needed to be executed once
endif
endfor