79. All owls are satisfactory; Some excuses are unsatisfactory.
80. All my cousins are unjust; All judges are just.
81. Some buns are rich; All buns are nice.
82. No medicine is nice; No pills are unmedicinal.
83. Some lessons are difficult; What is difficult needs attention.
84. No unexpected pleasure annoys me; Your visit is an unexpected pleasure.
85. Caterpillars are not eloquent; Jones is eloquent.
86. Some bald people wear wigs; All your children have hair.
87. All wasps are unfriendly; Unfriendly creatures are always unwelcome.
88. No bankrupts are rich; Some merchants are not bankrupts.