Terms for subject Idiomatic containing clear as day

English	Russian
as clear as day	ясно, как белый день (Andrey Truhachev)
as clear as day	ясно как божий день (Баян)
as clear as day	ясно как дважды два (четыре Andrey Truhachev)
as clear as day	ясно как божий день (Andrey Truhachev)
the reason is clear as day	а ларчик просто открывался (Taras)