Ding Dong Differential Doubles

Like Streatham, it is unusual in that the Treble and 2nd follow one blue line, which is 40 changes long, while the 3rd, 4th and 5th follow a separate blue line, 60 changes long. The plain course thus contains 120 changes. Watch out for all the wrong leading (backstroke and handstroke).

Treble and 2nd 3rd, 4th and 5th All together!