7) 4 elemanlı X={a,b,c,d} kümesi üzerinde 16 tane primal vardır.
P1=∅
P2={∅,{a},{b},{c},{a,b},{a,c},{b,c},{a,b,c}}
P3={∅,{a},{b},{d},{a,b},{a,d},{b,d},{a,b,d}}
P4={∅,{a},{c},{d},{a,c},{a,d},{c,d},{a,c,d}}
P5={∅,{b},{c},{d},{b,c},{b,d},{c,d},{b,c,d}}
P6={∅,{a},{b},{c},{d},{a,b},{a,c},{b,c},{b,d},{c,d},{a,b,c},{b,c,d}}
P7={∅,{a},{b},{c},{d},{a,b},{a,d},{b,c},{b,d},{c,d},{a,b,d},{b,c,d}}
P8={∅,{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{c,d},{a,b,c},{a,c,d}}
P9={∅,{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{b,d},{a,b,c},{a,b,d}}
P10={∅,{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,d},{c,d},{a,b,d},{a,c,d}}
P11={∅,{a},{b},{c},{d},{a,c},{a,d},{b,c},{b,d},{c,d},{a,c,d},{b,c,d}}
P12={∅,{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{b,d},{c,d},{a,b,c},{a,b,d},{a,c,d}}
P13={∅,{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{b,d},{c,d},{a,b,c},{a,b,d},{b,c,d}}
P14={∅,{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{b,d},{c,d},{a,b,d},{a,c,d},{b,c,d}}
P15={∅,{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{b,d},{c,d},{a,b,c},{a,c,d},{b,c,d}}
P16={∅,{a},{b},{c},{d},{a,b},{a,c},{a,d},{b,c},{b,d},{c,d},{a,b,c},{a,b,d},{a,c,d},{b,c,d}}