: help key  ( flush the carriage return form the input buffer )" The following are the standard known words; words marked with (*) areimmediate words, which cannot be used from command mode, but only inword definitions.  Words marked by (**) declare new words, so are alwaysfollowed by the new word.	! @		fetch, store	+ - * / mod	standard arithmetic operations	= < > <= >=	standard comparison operations	not		boolean not of top of stack	logical		turn top of stack into 0 or 1	dup over	duplicate the top of stack or second of stack	swap drop	reverse top two elements or drop topmost	inc dec		increment/decrement the value at address from stack	add		add a value from 2nd of stack into address from top	echo key	output character from, or input to, top of stack	. #		print out number on top of stack without/with cr	cr		print a carriage return[more]" key" (**)	var		declare variable with initial value taken from stack(**)	constant	declare constant with initial value taken from stack(**)	array		declare an array with size taken from stack(*)	if...else...then	FORTH branching construct(*)	do...loop		FORTH looping construct	i j			loop values (not variables)	print		print the string pointed to on screen(*)(**) :		declare a new THIRD word(*)	<build does>	declare a data types compile-time and run-time(*)	;		terminate a word definition[more]" key" Advanced words:	here		current location in dictionary	h		pointer into dictionary	r		pointer to return stack	fromr tor	pop a value from or to the return stack	,		write the top of stack to dictionary	'		store the address of the following word on the stack	allot		leave space on the dictionary	::		compile a ':' header	[		switch into command mode	]		continue doing : definitions" ;