I have this set of right hand open string exercises for classical guitar. Many are in 4/4 but some are in 6/8 (see pic below). The notes are grouped in 6 but there is no tuple notation. Reading as straight 6/8 I expect 12 16th notes per measure. Lines 1 and 2 show 24 16th notes per measure. My question is am I reading it wrong or is there a missing bar in each line separating each into 2 groups of 12 16th notes. Thanks.