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Composition of sets
{ x | x in R or x in S}
unioni Si = Sj1 union Sj2 union ...union Sjn
{ x | x in R and x in S}
intersecti Si = Sj1 intersect Sj2 intersect ...intersect Sjn
{ x | x c R }
({} in P(R), R in P(R))