I have a dataframe in R as follows:

ID  Group   Chr
S1  Case    amt5:8
S2  Case    amt5:9
S3  FC      amt5:8
S4  PC      amt5:8
S5  FC      amt5:9
S6  Case    nhtf:56
S7  FC      nhtf:56
S8  Case    klju:78
S9  PC      klju:78
S28 Case    kljik:098
S67 PC      hyjfk
S34 FC      lkoj

I want to remove all duplicated values from df$Group column with value “PC” which have same values for “Case” and “FC” in df$Chr column.
the expected output will be:

ID  Group   Chr
S2  Case    amt5:9
S5  FC      amt5:9
S6  Case    nhtf:56
S7  FC      nhtf:56
S28 Case    kljik:098
S67 PC      hyjfk
S34 FC      lkoj

The input df is:

dput(df)

structure(list(ID = c("S1", "S2", "S3", "S4", "S5", "S6", "S7", 
"S8", "S9", "S28", "S67", "S34"), Group = c("Case", "Case", "FC", 
"PC", "FC", "Case", "FC", "Case", "PC", "Case", "PC", "FC"), 
    Chr = c("amt5:8", "amt5:9", "amt5:8", "amt5:8", "amt5:9", 
    "nhtf:56", "nhtf:56", "klju:78", "klju:78", "kljik:098", 
    "hyjfk", "lkoj")), class = "data.frame", row.names = c(NA, 
-12L))