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ifelse(comment) ifelse(string-1, string-2, equal, opt not-equal) ifelse(string-1, string-2, equal, ...)
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ifelse(foo, bar, `true') ⇒ ifelse(foo, foo, `true') ⇒true ifelse(foo, bar, `true', `false') ⇒false ifelse(foo, foo, `true', `false') ⇒true
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