PER CURIAM:
Collin Johnson, a Maryland state prisoner, seeks a certificate of probable cause to appeal from an order of the district court dismissing his petition for habeas corpus on the ground that in a previous petition Johnson had deliberately withheld grounds for relief then known to him.
In 1964 Johnson filed a petition in the district court, in which he sought to allege various deprivations of his constitutional rights in the course of the proceedings...
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