val test = fn(a, b) {
	join([
	    "not {{a}}: {{not a}}",
	    "{{a}} and {{b}}: {{a and b}}",
	    "{{a}} nand {{b}}: {{a nand b}}",
	    "{{a}} or {{b}}: {{a or b}}",
	    "{{a}} nor {{b}}: {{a nor b}}",
	    "{{a}} xor {{b}}: {{a xor b}}",
	    "{{a}} nxor {{b}}: {{a nxor b}}",
	    "",
	
	    "not? {{a}}: {{not? a}}",
	    "{{a}} and? {{b}}: {{a and? b}}",
	    "{{a}} nand? {{b}}: {{a nand? b}}",
	    "{{a}} or? {{b}}: {{a or? b}}",
	    "{{a}} nor? {{b}}: {{a nor? b}}",
	    "{{a}} xor? {{b}}: {{a xor? b}}",
	    "{{a}} nxor? {{b}}: {{a nxor? b}}",
	    "\n",
	],
    delim="\n")
}

val tests = [
    [true, false],
    [false, true],
    [true, true],
    [false, false],

    # including null...
    [true, null],
    [null, true],
    [false, null],
    [null, false],
    [null, null],
]

for t in tests {
    write test(t[1], t[2])
}