Factor has the words if, when, unless, cond and case. That should usually be enough for anyone's needs. That said, I suspect that nesting conditional statement

Factor has the words if, when, unless, cond and case. That should usually be enough for anyone's needs. That said, I suspect that nesting conditional statements 3 or even 2 levels deep would become difficult to read. As a result, it'd probably be best to factor out various tests into their own words to keep things readable.