Two way mixed ANOVA in R with letter display

The two way mixed ANOVA includes the mixed model containing the independent observations and repeated measures (dependent observations). The R script containing the codes can be accessed through the link below https://drive.google.com/file/d/1oqmw... The template of excel file for arranging the data in excel can be seen through the link below https://docs.google.com/spreadsheets/... For any quarry, please comment below.