There seems to be a bug in the sparse6 string generator.
sage: G=graphs.EllinghamHorton78Graph()
sage: G.sparse6_string()
':~?@M_GEA_w?C`WGEaOOGaWWI_OmGBGKL`w}OcXINCxQGCPUWCp]WdPeOEh[Zc`q^Fh}_gXwagyAfGaYfhAa^IYEgIyqlji}ojREqfa{rlbCtljKvjbatMYWv_Jq|hBy{hSAdn{M
*\\*OCRAeRtEa_wVlSHBhagjkBgzpCY}OSr'
Notice the "\\" in the above string. This should have been "\" instead,
i.e. one backslash instead of 2. Normally sparse6 encoded graphs are stored
in a "myFile.s6" file. Storing the above String in a file, and then reading
it with another piece of software produces incorrect results, due to the
additional "\".
Note however that in the following command is correct:
sage:
F=Graph(':~?@M_GEA_w?C`WGEaOOGaWWI_OmGBGKL`w}OcXINCxQGCPUWCp]WdPeOEh[Zc`q^Fh}_gXwagyAfGaYfhAa^IYEgIyqlji}ojREqfa{rlbCtljKvjbatMYWv_Jq|hBy{hSAdn{M
*\\*OCRAeRtEa_wVlSHBhagjkBgzpCY}OSr')
Here, the extra "\" is indeed required since the graph is constructed from
a String.
Joris Kinable
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