On subsequent days, one or more rods are added to those already learned until the child can count all the rods.
(one or more rods; are added; to those; T:until the child can count all the rods; T:On subsequent days) (those; learned; T:already)
one or more rods those
are added learned
to those T:until the child can count all the rods T:On subsequent days
T:already