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путеводная нить stresses
gen.	Ariadne's clew; Ariadne's thread; road map; roadmap; guiding idea (Wolverin); clew; clue; guiding thread (Stas-Soleil)
Gruzovik	path marker tape; lead-in tape
fig.of.sp.	guide (AlexandraM)
lit.	a fil rouge (gerasymchuk)