In all other except (b), second is the organ used by first for its movement.
In all pairs except (d), first is the founder of second.
All expert ( b) are antonym pairs
In all pairs expert (a) ,first is a type of second.
In all pairs expert (b) , second is the sound made by first.
In all pairs expert (a) , both the word belong to thr same class.
In all other groups, there is a gap of one letters as in the alphabet between first and third letters.
All others have only one vowel.
All except '18' are square of natural numbers.
(5)2 = 25, (3)2 = 9, (4)2 = 16
4867 ? 4 + 8 + 6 + 7 = 25, which is divisible by 5.
5555 ? 5 + 5 + 5 + 5 = 20, which is divisible by 5.
6243 ? 6 + 2 + 4 + 3 = 15, which is divisible by 5.
6655 ? 6 + 6 + 5 + 5 = 22, which is not divisible by 5.
All others are complete squares.
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