We get 4GramCodeSurvival in "github.copilot-chat/codemapper.trackeditsurvival", "github.copilot-chat/applypatch.trackeditsurvival", but the score can not be tracted due to the lack of logging original strings. Here I propse to log strings that calcuate codeSurvivalRate (textBeforeAiEdits, textAfterAiEdits, textAfterUserEdits) to properties of "github.copilot-chat/codemapper.trackeditsurvival", "github.copilot-chat/applypatch.trackeditsurvival", which have SurvivalRateFourgram in measures.