Apologies if this has been posted before but a Mr Yoshi Nakagami has posted on Facebook with details of what the accurate lyrics to Sumahama are in a very interesting piece (to me at least).
This can be found here:
https://www.facebook.com/photo.php?fbid=634039246673968&set=a.634015046676388.1073741828.100002036942309&type=1&theaterClicking `open photo viewer` at the bottom of the page allows it to all be viewed.