Perhaps I need to be more specific.

main = do
 a <- getLine
 b <- getLine

Can we say "a" absolutely always receives the first line of input and if
so what makes this the case rather than "b" receiving it ? Or do things
need to be slightly more complicated to achieve this ?

Sorry it's just the engineer in me. I think once I've got this clear I'll
be happy to move on.

Jon

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