Mess in revision history

Help Joe clean up what Steve has cobbled.

Input

date         rel  who      what
2010-02-01   1.0  joe      initial version
2011-Feb-1 1.2 steve fixed some typos
2011-10-14 1.2 joe   copyrights updated
2014-01-09 2.0 joe   framework upgraded

Output

date         rel  who      what
2010-02-01   1.0  joe      initial version
2011-02-01   1.2  steve    fixed some typos
2011-10-14   1.2  joe      copyrights updated
2014-01-09   2.0  joe      framework upgraded