Two groups are studying how the tuberculosis bacterium can stay in the body so long.
(Two groups; are studying; how the tuberculosis bacterium can stay in the body so long) Context(Two groups are studying,List([0, 23))):(the tuberculosis bacterium; can stay; in the body; T:so long)
Two groups are studying,List([0, 23))
Two groups the tuberculosis bacterium
are studying can stay
how the tuberculosis bacterium can stay in the body so long
in the body T:so long