Please insert the missing letters in a partially completed 5x5 matrix, so
that each row and each column contains the same letters and at least one of the rows represents a common English word.
P****
***X*
**I**
*M*P*
****P
Source: derived from Donald's Knuth's puzzle (2009).
PXMIU
IUPXM
UPIMX
XMUPI
MIXUP