Solution=========From left mark the stones as 1,2,3,4,5,6,7.And the green frogs are g1,g2,g3.Brown frogs are b1,b2,b3.1.g1-42.b1-33.b2-54.g1-65.g2-46.g3-27.b1-18.b2-39.b3-510.g1-711.g2-612.g3-413.b2-214.b2-315.g3-5
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Solution
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From left mark the stones as 1,2,3,4,5,6,7.
And the green frogs are g1,g2,g3.
Brown frogs are b1,b2,b3.
1.g1-4
2.b1-3
3.b2-5
4.g1-6
5.g2-4
6.g3-2
7.b1-1
8.b2-3
9.b3-5
10.g1-7
11.g2-6
12.g3-4
13.b2-2
14.b2-3
15.g3-5