Before revision:  Based on comprehensive review and comparison study on representative OT and CRDT solutions and working co-editors based on them , we present our main research discoveries in relation to this question and beyond in a series of three related and complementary articles.
After revision:  To seek truth from facts, we set out to conduct a comprehensive and critical review of representative OT and CRDT solutions and working co-editors based on them , we present our main research discoveries in relation to this question and beyond in a series of three related and complementary articles.