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Try this Bruce.
Frogs...A B C _ D E F
Rocks...1 2 3 4 5 6 7
1) Leap Frog C to rock 4.
2) Leap Frog D to rock 3.
3) Leap Frog E to rock 5.
4) Leap Frog C to rock 6.
5) Leap Frog B to rock 4.
6) Leap Frog A to rock 2.
7) Leap Frog D to rock 1.
8) Leap Frog E to rock 3.
9) Leap Frog F to rock 5.
10) Leap Frog C to rock 7.
11) Leap Frog B to rock 6.
12) Leap Frog A to rock 4.
13) Leap Frog E to rock 2.
14) Leap Frog F to rock 3.
15) Leap Frog A to rock 5.
.........Voila!
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IT WILL TAKE A GENUIS TO WORK THIS ANSWER OUT...

....KASEY