package main _plain
	typename K_number = int32
	typename K_phrase_number____nothing = function K_number -> void
	package MyRoutine _code
		local (/main/K_number) x
		local (/main/K_number) y
		code
			inv !return
				val (/main/K_number) x
			inv !return
				inv !plus
					val (/main/K_number) x
					val (/main/K_number) y
			inv !return
				inv !minus
					val (/main/K_number) x
					val (/main/K_number) y
			inv !return
				inv !modulo
					val (/main/K_number) x
					val (/main/K_number) y