This example was suggested by Lando & Zvonkin (2004), pp. 109–110. Lando, Sergei K.; Zvonkin, Alexander K. (2004), Graphs on Surfaces and Their Applications, Encyclopaedia of Mathematical Sciences: Lower-Dimensional Topology II, vol. 141, Berlin, New York: Springer-Verlag, ISBN978-3-540-00203-1, Zbl1040.05001. See especially chapter 2, "Dessins d'Enfants", pp. 79–153.
Lando & Zvonkin (2004), pp. 120–121. Lando, Sergei K.; Zvonkin, Alexander K. (2004), Graphs on Surfaces and Their Applications, Encyclopaedia of Mathematical Sciences: Lower-Dimensional Topology II, vol. 141, Berlin, New York: Springer-Verlag, ISBN978-3-540-00203-1, Zbl1040.05001. See especially chapter 2, "Dessins d'Enfants", pp. 79–153.
Lando & Zvonkin (2004), p. 82. Lando, Sergei K.; Zvonkin, Alexander K. (2004), Graphs on Surfaces and Their Applications, Encyclopaedia of Mathematical Sciences: Lower-Dimensional Topology II, vol. 141, Berlin, New York: Springer-Verlag, ISBN978-3-540-00203-1, Zbl1040.05001. See especially chapter 2, "Dessins d'Enfants", pp. 79–153.
Jones, G. and Streit, M. "Galois groups, monodromy groups and cartographic groups", p. 43 in Schneps & Lochak (2007) pp. 25–66. Zbl0898.14012
Lando & Zvonkin (2004), pp. 90–91. For the purposes of this example, ignore the parasitic solution. Lando, Sergei K.; Zvonkin, Alexander K. (2004), Graphs on Surfaces and Their Applications, Encyclopaedia of Mathematical Sciences: Lower-Dimensional Topology II, vol. 141, Berlin, New York: Springer-Verlag, ISBN978-3-540-00203-1, Zbl1040.05001. See especially chapter 2, "Dessins d'Enfants", pp. 79–153.
acts faithfully even when restricted to dessins that are trees; see Lando & Zvonkin (2004), Theorem 2.4.15, pp. 125–126. Lando, Sergei K.; Zvonkin, Alexander K. (2004), Graphs on Surfaces and Their Applications, Encyclopaedia of Mathematical Sciences: Lower-Dimensional Topology II, vol. 141, Berlin, New York: Springer-Verlag, ISBN978-3-540-00203-1, Zbl1040.05001. See especially chapter 2, "Dessins d'Enfants", pp. 79–153.
Lando & Zvonkin (2004), pp. 122–123. Lando, Sergei K.; Zvonkin, Alexander K. (2004), Graphs on Surfaces and Their Applications, Encyclopaedia of Mathematical Sciences: Lower-Dimensional Topology II, vol. 141, Berlin, New York: Springer-Verlag, ISBN978-3-540-00203-1, Zbl1040.05001. See especially chapter 2, "Dessins d'Enfants", pp. 79–153.