On grammatical class:

va
location tense distance: near to ... ; there at ...; a medium/small distance from ...
vau
elidable: end of sumti in simple bridi; in compound bridi, separates common trailing sumti.
vi
location tense distance: here at ... ; at or a very short/tiny distance from ...
vu
location tense distance: far from ... ; yonder at ... ; a long distance from ...
vi ma
sumti question asking for a location: at/near what?.