Asymmetric cards (A->B, and then B->A,C in the reverse card)

(Or see how it's best to learn these things, maybe it won't include having to implement this feature.)

In this example, where Catalan is the learned language and Spanish the known one, ideally the CA-ES card would show "fer falta -> hacer falta", and then the ES-CA side would show "hacer falta -> fer falta, caldre":

Screenshot_2018-08-20-01-01-07

The reason for this suggested feature is that if we allow "caldre" to be in the CA-ES card, then the ES part would also have to include two other valid translations for it, ie. "tener que" and "ser necesario". But if that happens, then the CA side would then have to include "tener que"'s more direct translation, "haver de". So one would end up with a massive card with a lot of information, violating the 4th rule of formulating knowledge.

Edited by zed