Revert "Merge pull request #8 from akilism/sorted_cols"

This reverts commit afd4ca83b5a4b13c25dc193c0de78c30e4012101, reversing
changes made to 4c935e4c58651807c855ab7424b8dfb8af68b09a.
Merge pull request #9 from chriswhong/revert_pull_request_8

Revert "Merge pull request #8 from akilism/sorted_cols"