(14x^7 multiplied by y^5 multiplied by x^6 divided by 21x^12 multiplied by y^2)^4

what's with all the words?

((14x^7 y^5 x^6)/(21x^12 y^2))^4
((14x^13 y^5)/(21x^12 y^2))^4
((2xy^3)/3)^4
16x^4 y^12 / 81