for rrb je exam 2015

sir myself a candidate for the post of rrb je electronics post.I want to know from you that if i wish to submit form for both of the post RRB JE(signal) for ER as well as RRB JE(telecommunication)for SER in same time and by a same candidate.then is there any possibility to cancel both of the form as per RRB there any such criteria for RRB JE 2015 exam.pls help me to provide proper information for this problem and tell me can I eligible for submit two forms in same time for these two particular posts or not

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