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well there's plenty of comments on foo on there, as for the bar though, i'#d strongly think that that is just a derivation of logic notation, where a line (bar) over a variable, a, negates it. so in plain english you would have foo and not foo. obviosuly it's use doesn't make sense in terms of strict logic you can see the obvious relationship.
personally i really hate foo.... what's wrong with sensible variable names like...
arse
bum
hello
monkey
works for me.....
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