ref: 4bbf1d12b5c79eae94ba931052af66001659cc91
dir: /sys/lib/man/permind/dup1.awk/
function install(){lastf=$NF; last=$0; split($0,b,"\"")} $NF!=lastf {if(last!="") print last; install()} $NF==lastf {split($0,a,"\"") if(a[6]~/[-,]/||a[6]~/\(mi/) { split(a[6],aa,"[, ]") if(index(last,aa[1])==0) { print last install() } else if(b[6]!~/[,-]/&&b[6]!~/\(mi/) install() } } END {print last}