The three are the same , just starting a major third lower each time ,
EXCEPT for:
- the first chord of bar three is a minor in the first verse , major in the other two ,
and
- the first chord of bar one is a minor in the first two verses , major in the third verse
So I would learn the 4-and-bit-bar pattern and keep in mind that :
the first chord of bars 1 and 3 is
minor and minor for the first verse
minor and major for the second verse
major and major for the third verse
( and each verse starts a major third lower than the previous one. )
So 4-and-a-bit bars and two caveats would be easier to remember than 15 .
Hope that helps