import io:*

fun is_true():bool {
    return true
}

fun is_true_extra():bool {
    print("true_extra: ")
    return true
}

fun is_false():bool {
    return false
}

fun is_false_extra():bool {
    print("false_extra: ")
    return false
}

fun main():int {
    println("early or")
    if (is_true() || is_false_extra())
        println("was true")
    println("early and")
    if (is_false() && is_true_extra())
        println("was false")
    println()
    println("late or")
    if (is_false_extra() || is_true())
        println("was true")
    println("late and")
    if (is_true_extra() && is_false())
        println("was false")
    println()
    return 0
}