Limit for sametail/samehead definitions number in DOT ?


I tried to draw hierarchical graphs with dot, involving a limited number of nodes (about 30), but with more than 100 edges and, especially, many edges having to start from same points. So I used "sametail" attribute, but got an error at generation.
Looking for the reason of the failure, I noticed that I got the error if more than 14 "sametail" and/or "samehead" attributes are defined in the dot file I am defining (it works fine with 13 "sametail" definitions, but not over).

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