They go up by the mountains; they go down by the valleys unto the place which thou hast founded for them.

Thou hast set a bound that they may not pass over; that they turn not again to cover the earth.

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they flowed over the mountains,
    they went down into the valleys,
    to the place you assigned(A) for them.
You set a boundary(B) they cannot cross;
    never again will they cover the earth.

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