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/usr/share/vim/vim74/ftplugin/j.vim is in vim-runtime 2:7.4.052-1ubuntu3.

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" Vim filetype plugin
" Language:	J
" Maintainer:	David Bürgin <676c7473@gmail.com>
" Last Change:	2013-09-21

if exists("b:did_ftplugin")
  finish
endif
let b:did_ftplugin = 1

setlocal iskeyword=48-57,65-90,_,97-122
setlocal comments=:NB.
setlocal commentstring=NB.\ %s
setlocal formatoptions-=t formatoptions+=croql
setlocal shiftwidth=2 softtabstop=2 expandtab

let b:undo_ftplugin = "setl et< sts< sw< fo< cms< com< isk<"