!logic:
  (a? b?)
    [
    println("a and b: " a and b)
    println("a or b: "  a or b)
    println("not a: "   not a)
    println("a xor b: " a xor b)
    println("a nand b: " a nand b)
    println("a nor b: " a nor b)
    println("a not xor b: " a nxor b)
    ]