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(1)Upper bound of S1 = { 3 , 4 , 5 , 6 , 7 , 8 }

A lower bound of S1 =not Exists

Upper bound of S2 = { 6 , 7 , 8 }

Lower bound of S2 = { 1, 2, 3 }

(2)GLB(S1)=not Exists

LUB(S1)=3

GLB(S2)= 3

LUB(S2)=not Exist as both 6 and 7 are upper bounds and they are not related.
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