I have a question on the fingering on this sweeping exercise. I do not know what fingers to place can you help me, heres the exercise

-----12----------12--------12---------- 12-------------||
--12----------------12--12----------------- 12----------||
for the twelfth fret use your third finger, for the tenth fret use your first finger, and for the 15th fret use your fourth finger
if your little finger is finger 1, and thumb is 5 (although you obviously dont use your thumb) then in the order of notes you have tabbed it would be 3 2 4 1 4 2 3 repeated. i hope you can understand that!
Try making that first 12 a 13 or fret the 12 then roll your finger over a little to hit that next 12(With middle finger probably)....
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brot pls