これ四追いあるんだ1

手順: 1.H8, 2.I9, 3.I7, 4.G9, 5.H6, 6.J8, 7.H7, 8.H9, 9.J9, 10.K7, 11.H10, 12.F7, 13.G6, 14.I8, 15.F6, 16.E6, 17.G8, 18.F9, 19.E9, 20.J7, 21.I6, 22.J6, 23.J5, 24.K4, 25.K6, 26.I12, 27.E8, 28.F8, 29.F11, 30.L8, 31.I5