Думи, които започват с малки латински букви и са резервирани
за вградени предикати на Strawberry Prolog, версия 1.02

abs	animate	assert	asserta	assert_in	asserta_in	arccos
arcsin	arctg	beep	bitmap	brush	button	call
ceiling	chronometer	close	close_servers	close_window	color_text_back	color_text
const	cos	cosh	count_list	cursor	edit	ellipse
equal	execute	exp	fail_if	fail	float	floor
for	functor	get	get_date	get_property	get_text	get_time
icon	integer	invoke	is	less_than	line	log
log10	logoff	logon	menu	message	mod	nl
not_deeper_than	not	number	once	open	op	parent
pen	point	position	press_button	print	put	random
read	read_new_mail	rect	rem	repeat	retract	retract_in
retractall	rgb	round	scan	select_color	select_file	send_mail
set	set_property	set_text	sign	sin	sinh	size
sqrt	static	str_length	sub_string	system_color	terminate	text_out
tg	tgh	trace	true	update_window	var	wait
window	window_brush	write	xor	yes_no