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challenge@@1	challenge	trial	13
challenge@@1	challenge	dispute	11
challenge@@1	challenge	confrontation	8
challenge@@1	challenge	difficulty	6
challenge@@1	challenge	contest	4
challenge@@1	challenge	task	4
challenge@@1	challenge	hardship	3
challenge@@1	challenge	obstacle	3
challenge@@1	challenge	question	3
challenge@@2	challenge	test	21
challenge@@2	challenge	contest	20
challenge@@2	challenge	trial	16
challenge@@2	challenge	competition	13
challenge@@2	challenge	duel	5
challenge@@2	challenge	dispute	4
challenge@@2	challenge	fight	4
challenge@@2	challenge	battle	2
challenge@@2	challenge	event	2
challenge@@2	challenge	game	2
challenge@@2	challenge	rivalry	2
challenge@@2	challenge	threat	2