Aclose(pipefd[1]) close(pipefd[0])
Bclose(pipefd[0]) close(pipefd[1])
Cclose(pipefd[0]) close(pipefd[0])
Dclose(pipefd[1]) close(pipefd[1])
Aclose(pipefd[1]) close(pipefd[0])
Bclose(pipefd[0]) close(pipefd[1])
Cclose(pipefd[0]) close(pipefd[0])
Dclose(pipefd[1]) close(pipefd[1])
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