Except '143', all others are of the form 12 n + 1 but 143 is of the form 12 n - 1, where n is a natural number.
Except 'Silk' , all others are artificial.
Except 'Flute' , all other are string instruments.
Except 'IM', in all the other, there is a gap of two letters.
In SLEEP,SHEEP and GREED,place of 'EE' is second from the right end while in TEETH,EE is second from the left end.
In all others, 1st letter + 3 = 2nd letter
And, 1st letter - 2 = 3rd letter
All other are adjectives denoting size.
Except '78', if you subtract 1, all the others give a prime number.
Except 'Sweet', all the others are baked items.
83 is the only number which is prime, while others are composite numbers.
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