gistfile1.txt

 $ git ls-tree -r origin/master|cut -f2|tr A-Z a-z|sort|uniq -c|sort -n
      2 include/linux/netfilter_ipv4/ipt_ecn.h
      2 include/linux/netfilter_ipv4/ipt_ttl.h
      2 include/linux/netfilter_ipv6/ip6t_hl.h
      2 include/linux/netfilter/xt_connmark.h
      2 include/linux/netfilter/xt_dscp.h
      2 include/linux/netfilter/xt_mark.h
      2 include/linux/netfilter/xt_rateest.h
      2 include/linux/netfilter/xt_tcpmss.h
      2 net/ipv4/netfilter/ipt_ecn.c
      2 net/netfilter/xt_dscp.c
      2 net/netfilter/xt_hl.c
      2 net/netfilter/xt_rateest.c
      2 net/netfilter/xt_tcpmss.c