Stem unavoid$ (all stems)
2 papers:
- LATA-2010-Leupold #context-free grammar #word
- Primitive Words Are Unavoidable for Context-Free Languages (PL), pp. 403–413.
- DLT-2007-Blanchet-SadriBP #set #word
- Two Element Unavoidable Sets of Partial Words (FBS, NCB, JP), pp. 96–107.