a=apple,b=apple
a=apple,b=apple
a=apple,b=apple
a=apple,b=apple
a=apple,b=apple
a=apple,b=apple
a=bat,b=cat
a=bat,b=cat
a=bat,b=cat
a=bat,b=cat
a=bat,b=cat
a=cat,b=bat
a=cat,b=bat
a=cat,b=bat
a=cat,b=cat
a=dog,b=dog
a=dog,b=dog
