Before revision:  Based on comprehensive reviews on representative OT and CRDT solutions and working co-editors based on them , we present our discoveries , in relation to these questions and beyond, in three articles. We also reveal facts and present evidences that refute CRDT claimed advantages over OT .
After revision:  Based on comprehensive reviews on representative OT and CRDT solutions and working co-editors based on them . From this work, we have made important discoveries about OT and CRDT, and revealed facts and evidences that refute CRDT claimed advantages over OT .