[lemma=","] [tag=VBD] [tag=DT] [□]
[lemma=","] [tag=VBD] [tag=DT] [□=□]
[lemma=","] [tag=VBD] [tag=DT] [□ & □]
Some of his listeners , however , suspected an even deeper agenda . What this group discovered using a heavy ion collider , was an even earlier stage known as the quark-gluon plasma state .