The Belfry, a shared social space to group up, manage inventory, and take on quests
a journal in accounting terminology) have to be rounded up by the back office。关于这个话题，safew官方版本下载提供了深入分析
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- assignment: Array of booleans. If the formula is satisfiable provide an assignment for each variable from 1 to N. If the formula is not satisfiable this field is null.