Nothing is permitted to escape taxation, and duplicated taxes on the same thing are frequent.
The expense of this re-creation probably duplicated, at least, the loss from the conflagration.
The motion of a jet impinging on an infinite barrier is obtained by putting j = a, j' = a'; duplicated on the other side of the barrier, the motion reversed will represent the direct collision of two jets of unequal breadth and equal velocity.
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