Duncan test with letters a b c on SPSS

Duncan Multiple Range Test (DMRT) with Compact Letter Display (CLD) is about how to write abcdefg ... on results generated from ANOVA with Posthoc test.
The sequence of giving letters can be from right to left also. The researcher should be consistent in giving letters to the mean scores of each subset of the Duncan test.
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[@elizabethjoy934]

Sir, Please give the interpretation of the post hoc part. How do we say one subset is better than the other? Is it again using the mean?
Thankyou for the video.

[@azzaomran987]

I analysed the data but i noticed that the leterrs were. a, b , bc,d. without c, could you please explain why c letters diid not appears?