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Let P = (x1, d1) -> (x2, d2) and Q = (x2, d2) -> (x3, d3)....

Let P = (x1, d1) -> (x2, d2) and Q = (x2, d2) -> (x3, d3). P and Q are covering maps. Show that the composition of P and Q (P ◦ Q) is also a covering map from (x1, d1) to (x3, d3). Thank you!

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