No individuals are zebras. Either tropisms occur in apes or taxes occur in bees. Tropisms occur in apes and taxes occur in bees. If tropisms occur in apes then taxes do not occur in bees. Either tropisms do not occur in apes or taxes do not occur in bees.
All dace are platy.
Some dace are cod. Some cod are not platy. Some cod are platy. All platy are dace. All dace are not cod.