The vaccine helps prevent four of the five strains of the disease.
(The vaccine; helps; prevent four of the five strains of the disease) Context(The vaccine helps,List([0, 17))):(The vaccine; helps prevent; four of the five strains of the disease)
The vaccine helps,List([0, 17))
The vaccine The vaccine
helps helps prevent
prevent four of the five strains of the disease
four of the five strains of the disease