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In another case the indentiation of lines 2-4 in the INCREMENT block contain NO-BREAK-SPACE characters (0xa0 / 160) instead of the usual tab characters. Only tab and space characters are allowed. In some editors, a NO-BREAK-SPACE is visually indistinguisable from space, but when you "type" or " cat " the file, that character typically show up as "รก":
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