Provided by: nauty_2.5r9+ds-1_amd64 
NAME
nauty-labelg - canonically label graphs
SYNOPSIS
labelg [-qsg] [-fxxx] [-S|-t] [-i# -I#:# -K#] [infile [outfile]]
DESCRIPTION
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. Multiple edges are not supported. One loop per
vertex is ok.
-t Use Traces.
Note that this changes the canonical labelling. Multiple edges and loops are not supported, nor
invariants.
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 rules:
(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, 16 = refinvar(K))
-I#:# select mininvarlevel and maxinvarlevel (default 1:1)
-K# select invararg (default 3)
-q suppress auxiliary information