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https://git.oschina.net/WLjava/DataStructuresAndAlgorithm/blob/master/src/main/java/chapter10/random/Witness.java?dir=0&filepath=src%2Fmain%2Fjava%2Fchapter10%2Frandom%2FWitness.java&oid=fb4a63bc86c94b6ae84850aeaa968632598db4ea&sha=3957933c930759c5efc0c1c37ca550a0f48a96bc