[lemma=must] [tag=RB] [tag=VB] [tag=□] □
[lemma=must] [tag=RB] [tag=VB] [tag=JJ] □
[lemma=must] [tag=RB] [tag=VB] [tag=RB] □
However , ILECs must still provide unbundled access to a voice grade equivalent channel and high capacity loops utilizing TDM technology , such as DS1s and DS3s .