def: prf.aa()
	~dos.print("\F\x0a")
end def

def: prf.bb($a, $b)
	ret: $a + $b
end def

~prf.aa() 'ӷ prf 禡

~dos.print("2 + 3 : " ~prf.bb(2, 3) "\x0a")

~dos.system("pause")