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Simplify:
#(a) x^2×x^4#
#(b) y^3×y^6#
#(c) n^13×n^(-7)#
#(d) a^9×a^3#
#(e) a^(-2)×3a^4#
#(f)(2n)^3×(2n)^5#
#(g) x^16÷n^12#
#(h) a^15÷a^14#
#(i) a^2×b^2×a^4#