retag fad, far and mar as NOUN where they are clearly not being used as conjunctions or prepositions

[colinbatchelor]

fp09_024 (dev)

Tha na h-obraichean ud a' toirt fianais dhuinn air mar a bha féin-mhisneachd ann a-measg nan Gàidheal

'Those works give us evidence on how there was self-confidence among the Gaels'

Currently bha in the above sentence is annotated with mar being the subordinator (mark) and air being the adposition (case). It will be simplier for the validator if we treat mar as a noun like fad, linked to air with the case relation and link bha to it with an acl:relcl relation.

Another option would be to create MWEs linked with fixed like air mar and gu fad but this seems simplest and easiest to explain.