Puzzle 8990: obvious but tricky

i think i've seen this before!

Author:	csgroup11
Date posted:	11/22/2016 2:05:20 AM
Difficulty (1..5):	1.22 (27 votes)
Popularity:	18 (25 liked, 7 disliked)
Correct solution submitted:	286

Solved by 193 players

_nick (4)	360506 (4)	362171 (4)	404225 (4)	408890 (4)
411209 (4)	413064 (4)	419513 (4)	420792 (4)	422435 (4)
423278 (4)	423398 (4)	428262 (4)	428409 (4)	428994 (4)
429102 (4)	430196 (4)	430479 (4)	442495 (4)	452900 (4)
46324100 (4)	463318 (4)	472225 (4)	475043 (4)	475153 (4)
476445 (4)	483273 (4)	483945 (4)	484573 (4)	484936 (4)
485807 (4)	501021 (4)	antonbootsma (4)	argenord (4)	arkangelsk1 (4)
axorion (4)	barajasba1342 (4)	brubru (4)	carykh (4)	cowans (4)
dannythorne (4)	edsaw (4)	gravity8879 (4)	hero (4)	Inconight (4)
jnpollack (4)	kenyamad (4)	kowka_z (4)	lalala (4)	martosss (4)
onqt (4)	padre (4)	pento (4)	poopi (4)	ppetrov (4)
scifista42 (4)	scorpio (4)	smylic (4)	stijn (4)	sungyeonpark (4)
tadano (4)	TimThree (4)	tiyo (4)	xbox_rob (4)	420227 (5)
496472 (5)	1234alberto (6)	1234angela (6)	365642 (6)	408771 (6)
413937 (6)	485536 (6)	4RP4D (6)	9651410232 (6)	adegnorr (6)
aja2718 (6)	ajayjha25 (6)	alatristecap (6)	amazed (6)	Anabirelle (6)
Angrevol (6)	atzame (6)	azhou (6)	benjaminRR (6)	beseech (6)
bikonon (6)	ceecee (6)	covex-nn (6)	davenger (6)	Davoust (6)
Denyvoda (6)	djebby (6)	DonDiego2000 (6)	DrRoboProX (6)	drwatson (6)
EchelonBCN (6)	Egorovsasa (6)	eversyt (6)	eyTns (6)	fatkiev (6)
Fifiasokon (6)	filiep (6)	fperdu (6)	gglifer (6)	giridhar1202 (6)
goetz (6)	goulagman (6)	hilbert (6)	Hudson (6)	Ich (6)
incal1 (6)	jhnesk (6)	kalzhan_1992 (6)	KeyoN (6)	kraker (6)
kserikba (6)	leesangwook (6)	libbyhyry (6)	lini (6)	lka_76 (6)
maruska (6)	mathmasterzach (6)	Meddaif99 (6)	milusheva (6)	MIRAIOHTO (6)
moul (6)	namayake (6)	Nanaki404 (6)	napo1769 (6)	neenthewiser (6)
nereidas09 (6)	p1xm0x (6)	Player (6)	PLeil (6)	plinooker (6)
prick477 (6)	racello (6)	rahul9493 (6)	razimantv (6)	RCStef (6)
Rezak (6)	rilke (6)	robozlov (6)	romashka (6)	Sirusc (6)
softa (6)	talestales (6)	Tharro (6)	tijl (6)	woodsdd1029 (6)
xavierdarmon7 (6)	yannickruault (6)	YoSo (6)	zlejrob (6)	363699 (7)
420829 (7)	421850 (7)	AZAMI (7)	carrben12 (7)	Chirector (7)
copis (7)	dmmn (7)	dougheim (7)	emmagineif (7)	JackHarkness23 (7)
NoThlnG (7)	Ptolo (7)	QAJor (7)	Rondholz (7)	ssancho (7)
432796 (8)	435027 (8)	451139 (8)	483119 (8)	500974 (8)
502706 (8)	arubaro (8)	belenus (8)	csgroup11 (8)	Dharavi (8)
dickwaggin (8)	drmazhar (8)	elicule (8)	gjgd (8)	Jumao (8)
leokaiser (8)	lordofdead38 (8)	qwertymol (8)	sharpie (8)	silver (8)
swiftoutlaw (8)	twoflower (8)	ym1029sun (8)

Number of commands in the solution is shown in brackets. Shown as ? when not available.