In marking the music a soft pencil should be used with as little pressure as possible as an eraser will remove any slight marking as long as there are no grooves.
(a soft pencil; should be used; with as little pressure as possible) (an eraser; will remove; any slight marking; T:as long as there are no grooves)
a soft pencil an eraser
should be used will remove
with as little pressure as possible
any slight marking T:as long as there are no grooves