The file variant-also.tab contains additional mappings between various spellings of a word which are not necessarily region dependent. Only mappings that are not listed in abc.tab are included in this mapping. No attempt is made to distinguish the primary form of a word. Both the translation array and variant table includes a lot of strange affixations of words which I have no intention of removing as some people might find them useful. The common.lst file contains words that were marked in the last column as explained above and the other three contain all the possible words that might be used by that particular country, included some of the words marked in the last column.
Text is read in from standard input and is outputted to standard out.
These mappings were compiled from numerous sources. Canadians use ize ization, izing izable like Americans, and gram instead of gramme. The one exception I found was practise. It does not go to practize. Otherwise they use British spelling.