Practicing Success
Which one set of letters when sequentially placed at the gap in the given letter series shall complete it. d _ c b b _ b d b _ d b d b c _ b d b d _ c d b
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bdcbb ccdbb cddbc dcbdd |
bdcbb |
d [b] c / b b [d] /b d b / [c] d b / d b c / [b] b d / b d [b] / c d b |