How do I find the most common mutations in a MAF dataset?

Question

[melissachua90]

How do I find the most common mutations in a MAF dataset? Should I use pfamDomains from maftools?

library(maftools)

d <- merge_mafs(lapply(Sys.glob("mafs/Patient*.maf"), read.maf))

d.pfam = pfamDomains(maf=d, AACol="Protein_Change", top=15)
d.pfam$proteinSummary[,1:7, with=FALSE]