In a certain code language, '123' means 'hot filtered coffee', '356' means 'very hot day' and '145' means 'coffee is hot'. Which digit stands for 'filtered'?
Explanation:
From first and third, hot and coffee common digits 1 and 3 or 5? 123 and 145 share 1. From first and second, hot =3. Thus from first, filtered =2 (coffee is the remaining 1).
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