The thirds at a lie in the first two positions. At b, the upper note is taken on the lower string, and either in the 3ʳᵈ, 4ᵗʰ, 5ᵗʰ or 6ᵗʰ position.
Fourths:
a lies in the first position, at b the higher note is again produced on the lower string (as a harmonic note) in the 4ᵗʰ position.
Fifths:
