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трудная задача akcenty
posp.	baffling problem; poser; teaser; tickler; large order; tall order; back-breaker; puzzler; son of bitch; stumper; waffle; beast of a job; an uphill task; a tall order; the deuce and all to pay; the devil to pay; demanding task (mascot); toughy (Translucid Mushroom); Delian problem; back breaker; son of a bitch; sonof a bitch; sonofa bitch; hump; twister; challenging task (Taras); a hard nut; a stiff task; hard problem; the deuce and all to pay; tall task (England face tall task to beat Slovenia's goalkeeper Samir Handanovic VLZ_58); a hard nut to crack; uphill struggle (VLZ_58); significant challenge (Alex_Odeychuk); tough hill to climb (a tough hill The loss dropped the Lakers to 30-35 on the season, and they are now 6.5 games out of a playoff spot in the Western Conference, which will be a tough hill to climb with just 17 matchups remaining. george serebryakov); brain teaser (Taras)
Игорь Миг	hard choices
amer.	bloody murder; a hard row to hoe; uphill battle idiom (или ситуация; It will be an uphill battle for him to win the election given recent bad press coverage. Val_Ships)
amer., makar.	blue murder
amer., slang	funsie; funsey
austral., slang	can of worms
bizn.	difficult task; challenge
brytań.	bugger
dial.	capper
dypl.	hard task
idiom.	difficult needle to thread (Журнализм, идиома. Подсмотрел в "Экономисте". CopperKettle)
iron.	fun and games
kolej.	formidable task
makar.	a headache problem; a tough row to hoe; hard nut to crack; headache problem; heavy task; stiff problem; tough nut to crack; tough row to hoe; troublesome problem; uphill task; a tough nut to crack; arduous task
mat.	a challenging task; a challenge
medyc.	difficulty task
nief.	bitch (the stove is a bitch to fix Val_Ships)
olej.	challenge (сущ. serz)
retor.	difficult challenge (Alex_Odeychuk)
slang	real bitch; son of a gun (This is a really son of a gun job! == Это в самом деле хреновая работёнка!)
wojsk.	challenging operation
wulg.	whiz-bitch; ball-breaker (a job or situation that is demanding and arduous and punishing ("Vietnam was a ball-breaker") – трудновыполнимая, как правило, неприятная работа)
łac.	pons asinorum
NP-трудная задача
elektron.	nondeterministic polynomial time hard; NPH problem
progr.	nondeterministic polynomial time hard problem (ssn)
чрезвычайно трудная задача
posp.	daunting task (Harry Johnson)

трудная задача: 79 do fraz, 18 tematyki

Amerykański używanie	4
Bezpieczeństwo informacji i ochrona danych	3
Biznes	5
Dialekty a topolekty	1
Edukacja	1
Ekonomia	1
Idiomatyczny	2
Makarowa	18
Nieformalny	3
Pospolicie	29
Przenośnie	3
Retoryka	3
Slang	1
Systemy bezpieczeństwa	1
Szachy	1
Wojskowość	1
Wulgaryzm	1
Zasoby ludzkie	1