Complex sentences
n Complex sentences are made from
atomic sentences using connectives
S, S1 S2, S1 S2, S1 S2, S1 S2,
E.g. Sibling(KingJohn,Richard)
Sibling(Richard,KingJohn)
     >(1,2) ≤ (1,2)
     >(1,2) >(1,2)