vale los perritos vienen
vale los perritos vienen .
b a l e WORD_BOUNDARY l o s WORD_BOUNDARY p e r i t o s WORD_BOUNDARY β j e n e n WORD_BOUNDARY
v a l e WORD_BOUNDARY l o s WORD_BOUNDARY p e r r i t o s WORD_BOUNDARY v i e n e n WORD_BOUNDARY