Basque bi

← Basque biga (mention)

← Basque bida (mention)

← Proto-Basque *biga (inherited)

← Iberian bi (cognate)

→ Basque hamabi (affix)

→ Basque biki (compound)

→ Basque hogeita bi (mention)

→ Basque berrogeita bi (mention)

→ Basque hirurogeita bi (mention)

→ Basque bigarren (affix)