???
an cat
cats
a cat
???
an cats
a cat
cats
???
a egg
an egg
eggs
???
a egg
an egg
eggs
???
an dog
a dog
dogs
???
dogs
an dog
a dog
???
a apple
apples
an apple
???
apples
an apple
a apple
???
a book
books
an book
???
a book
an book
books
???
a orange
oranges
an orange
???
a orange
an orange
oranges
???
pens
a pen
an pen
???
an pen
a pen
pens
???
elephants
an elephant
a elephant
???
a elephant
an elephants
elephants
