In a certain code language, '123' means 'bright little boy',
'145' means 'tall big boy' and
'637' means 'beautiful little flower'.
Which digit in that language means 'bright' ?
In the first and second statements, the common code digit is '1' and the common word is 'boy'.
So, '1' means 'boy'.
In the first and third statements, the common code digit is '3' and the common word is 'little'.
So, '3' means 'little'.
Thus, in the first statements, '2' means 'bright'.