SOLVABLE

Before
1: S
are
2: SU
problems, problem
3: SUU
easily
3: USU
uniquely, exactly
5: UUSUU
analytically
After
1: S
group, through, in
2: SU
models, problems, problem, series, model, only
Surrounder Phrases
finite set, time, series, being, models, groups, form, group, modellie within, exactly, in, groups, grouptime series, beingwithout being, usinganalytically using, becauseefficiently using, without, through, because, withinusing equations, finitemodel equations, analytically, using, systemproblem analytically, because, usingeasily becomeare polynomially, uniquely, readily, potentially, easily, being, analyticallygroups within, areequations using, are, become, models, modelmodels are, usingdominance within, model, inseries modelsonly because, throughproblems lie, are, efficiently, within, in, using, becausesystem using, modelcases arebut because, only, withoutbeing uniquelyreadily becomebecome readilygroup withinform withoutwithin groups