A lot of fun mental test, you need to swap the location of all the frogs around, oh very difficult to try and challenge it.
Let both sides frog exchange locationusually an annual salary of $100000 level,3 minutes to complete

1: point frog head, it will jump forward;
2: it only skip a frog;
3: failed to restart.
4 : this problem must have a solution, no doubt.

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