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Again , because concurrent cocaine-alcohol dependence has been associated with higher severity of cocaine use and poorer prognosis with respect to cocaine dependence alone , subjects in this study may be similar to the more severely dependent subsample from our earlier study . The Concurrent Design methodology has been used in all twenty generations of mobile computers described above . New seasonal factors based on the concurrent adjustment method have been incorporated , resulting in revisions to all seasonally adjusted and trend series . However , in adhering the two sheets together , their moisture sensitivity and concurrent dimensional instability had to be circumvented . To my knowledge , measurements of concurrent vertical acuity have not been published .