Not tootough, the secret is to ensure that at the early stages you don't have the same colour toads next to each other.
Number the pads 1 through 6 andmove the frogs/toads as follows
5->4, 3->5, 2->3, 4->2, 6->4, 7->6, 5->7, 3->5, 1->3, 2->1, 4->2, 6->4, 5->6, 3->5, 4->3

this makes no sense but, ive done it now anyway.
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