Those three problems are all__,but this one is__.(difficult)

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Those three problems are all__,but this one is__.(difficult)

Those three problems are all__,but this one is__.(difficult)
Those three problems are all__,but this one is__.(difficult)

Those three problems are all__,but this one is__.(difficult)
difficult
the most difficult

difficult
the most difficult (最难的)或the least difficult(最不难的)