COMETS

Before
1: S
cloud, bright, small, new, three, two, these, most
2: SU
houston, period, family, many, other
2: US
about, between
3: SUU
period, several, family
4: UUSU
periodic
After
1: S
move, are, seen, come, have, may, which, do
Surrounder Phrases
interstellar cloud, travelparabolic orbit, typeperiodic orbitextinct giant, during, familyfive billionfiery cloudeight billionsurrounding interstellar, cloudfour billion, giant, largeseveral billion, other, recent, large, small, extinctthree billionmost recent, active, distantsplit betweenmay seem, originate, contain, appear, have, come, pass, show, movefaint cloud, distantpassing cloud, near, between, showbright cloudorbit split, about, near, period, whosetwo billion, giant, large, small, other, recent, parabolichave seen, come, discovered, appeared, known, formed, observedfew billion, faint, small, other, large, brightgiant cloud, whosecloud surrounding, passing, appeared, formed, came, coming, type, passthese two, three, four, are, fivegrazing near, period, duringformed during, themselves, between, nearnear houston, grazingdistant cloud, period, travelabout eight, five, four, three, themselves, twobetween two, these, themselvesobserved during, between, nearcame near, aboutcontain several, many, large, certain, two, small, four, three, eightmany other, smallcome near, aboutcertain type, period, otherwhose fiery, family, orbit, icy, brightare formed, known, several, seen, coming, many, observed, two, extinctperiod during, betweenwhich originate, contain, appeared, may, are, appear, formed, seemlarge parabolic, family, grazing, cloudbelt surrounding, near, between, formedoriginate near, duringdiscovered near, during, severalknown aboutshow themselvesnew approach, typeappear brightsmall cloud, familyactive during, approachrecent periodduring which, recent, thesepass near, betweenobserving certain, thesecoming nearseen grazing, coming, near, passingseem distantfamily whoseappeared duringtravel between, passbillion duringmove aboutthemselves contain, are, seemconcerning certain, these, themselvesapproach mayother two