Below it is possible to find an extract from Chapter 1.3 of Munkres' "Elements of Algebraic Topology", which concerns the triangulation of the torus.
I have the following question regarding Figure 3.5: do we really need $af$, $fh$, $hj$, and $ja$?
Indeed, I have in mind other triangulations of the torus where all these segments are missing.
Every feedback will be (more than) greatly appreciated, since I find all this truly impenetrable.
Thank you for your time!