Add methods that expose partial linearizations

[anishathalye]

Addresses #21.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 43 lines in your changes missing coverage. Please review.

Project coverage is 80.40%. Comparing base (d372c58) to head (29dfede).

Files with missing lines	Patch %	Lines
checker.go	0.00%	43 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #22 +/- ## ========================================== - Coverage 89.02% 80.40% -8.63% ========================================== Files 5 5 Lines 401 444 +43 ========================================== Hits 357 357 - Misses 35 78 +43 Partials 9 9 ```

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