----------------------------< S U B >------------------------------------------------------------------------
local function sub (frame) local a = frame.args[1] local b = frame.args[2] return a - bend
----------------------------< A D D >------------------------------------------------------------------------
local function add (frame) local a = frame.args[1] local b = frame.args[2] return a + bend
----------------------------< E X P O R T E D F U N C I O N S >--------------------------------------------
return