Location Words (here,there)

[wafflestomp]

Okay, so I thought I had a good understanding of these until I started seeing other words...

here's how I understood it-- aqui = here allí = an area away from both the speaker and the listener and ahí = an area by the listener away from the speaker, allí meaning like 'over there' and ahí meaning just 'there'..

however, I saw these words "aca" and "alla" and i'm not sure what they mean..

thanks for anyone who can help clear this up