set seed 17760704
import delimited http://www.puzzlers.org/pub/wordlists/unixdict.txt, clear
save temp, replace
replace v1=strreverse(v1)
merge 1:1 v1 using temp, nogen keep(3)
drop if v1>=strreverse(v1)
count
  158
sample 5, count
gen v2=strreverse(v1)
list, noheader noobs
  +-------------+
  | evil   live |
  |  pat    tap |
  |   at     ta |
  |  nit    tin |
  |   ku     uk |
  +-------------+