I would like to select a all the duplicate rows of a data frame including
the original.  Any help would be much appreciated.  This is where I'm at so
far. Thanks.

#Sample data frame:
df <- read.table(header=T, con <- textConnection('
 label value
     A     4
     B     3
     C     6
     B     3
     B     1
     A     2
     A     4
     A     4
'))
close(con)

# Duplicate entries
df[duplicated(df),]

# label value
#     B     3
#     A     4
#     A     4

#I want to select all the rows that are duplicated including the original
#This is the output I want
# label value
#     B     3
#     B     3
#     A     4
#     A     4
#     A     4

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