mingle

Bundle the edges of a graph layout. Graphviz filters: acyclic, bcomps, comps, edgepaint, gvcolor, gvpack, mingle, nop, sccmap, tred, & unflatten. More information: https://www.graphviz.org/pdf/mingle.1.pdf.

mingle path/to/layout1.gv path/to/layout2.gv ... > path/to/output.gv

dot path/to/input.gv | mingle | dot -T png > path/to/output.png

mingle -?