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# `if` macro, think of it as a statement I guess?
# else is used by the `if` command in C, presumably?
if {< i 10} {
println "a"
} {< i 20} {
println "b"
} else {
println "c"
}
# `if` procedure, think of it as expr-if in other languages I guess
# note that all arguments get evaluated here, so if you have a slow function in
# one branch you should probably prefer `if` statements
let x (do-if (< i 10) "a" (< i 20) "b" else "c")
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