count the number of duplicate rows per value in a specific column in r

# Sample data
df <- data.frame(id = c(1, 2, 3, 4, 4, 5),
                 value = c("A", "B", "A", "C", "C", "B"))

# Count the number of duplicate rows per value in the 'value' column
dup_count <- table(df$value)

# Display the count of duplicate rows per value
dup_count
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