On the leftern side in figure 1 there is sketched a structure consisting of 18 elements, which are connected in 10 nodes. [...] According to the scheme shown on the rightern side of figure 1: the grey squares stand for non-null valued coefficients, ...
Source: wiktionary
If a player chooses Phallicity, she is eventually sent to the “Rightern” edge of the forest (it is a side-scroller after all), she will be asked to spy on “Mr. Marx” [...] Lumpen is sent to the Abbey down by the “Leftern”-most edge [...]
Source: wiktionary
Eventually a truce was declared and a line drawn between the leftern and the rightern semispheres.
Source: wiktionary