Five numbers, three darts each, doubles only to finish: ladder #224 asks for 2, 50, 71, 86 and 128.
2 is a straight double: D1. A miss into the single leaves an odd number, so the next dart has to set up a double before you can finish. 50 is a straight double: Bull. A miss into the single leaves an odd number, so the next dart has to set up a double before you can finish.
71 is a two-dart finish: T17 D10. 86 is a two-dart finish: T18 D16. 128 needs all three darts: T19 T17 D10. If the first dart misses its treble, the board will show the new route straight away.
One route here finishes on the bull (Bull for 50); it counts as a double.
At best the five finishes need 9 darts out of 15. Your result counts the finishes you make first and the darts you used second. These are friendly numbers. Aim at the inside half of the double on the first dart — a miss on that side lands in the single and keeps the finish alive.