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       labelg - Canonically label a file of graphs.


       labelg [-qsg] [-fxxx] [-S] [-i# -I#:# -K#] [infile [outfile]]


              Canonically label a file of graphs.

       -s     force output to sparse6 format

       -g     force  output  to graph6 format If neither -s or -g are given, the output format is
              determined by the header or, if there is none, by the format  of  the  first  input
              graph. Also see -S.

       -S     Use sparse representation internally.

              Note  that  this changes the canonical labelling.  Only sparse6 output is supported
              in this case.  Multiple edges are not supported.  One loop per vertex is ok.

              The output file will have a header if and only if the input file does.

       -fxxx  Specify a partition of the point set.  xxx is any

       string of ASCII characters except nul.
              This string is

              considered extended to infinity on the right with the character 'z'.  One character
              is  associated with each point, in the order given.  The labelling used obeys these

              (1) the new order of the points is such that the associated

              characters are in ASCII ascending order

              (2) if two graphs are labelled using the same string xxx,

              the output graphs are identical iff  there  is  an  associated-character-preserving
              isomorphism between them.  No option can be concatenated to the right of -f.

       -i#    select an invariant (1 = twopaths, 2 = adjtriang(K), 3 = triples,

              4  = quadruples, 5 = celltrips, 6 = cellquads, 7 = cellquins, 8 = distances(K), 9 =
              indsets(K), 10 = cliques(K), 11 = cellcliq(K),

              12 = cellind(K), 13 = adjacencies, 14 = cellfano, 15 = cellfano2)

       -I#:#  select mininvarlevel and maxinvarlevel (default 1:1)

       -K#    select invararg (default 3)

       -q     suppress auxiliary information