Given a text, write a compressed version of it in a single sentence.

But that does not mean that such a square cannot exist.
Such a square can exist.

The collections have been sent to OMB for approval and the requirement is not effective until approved by OMB and a control number is issued.
The collections are not effective until approved by OMB and a control number is issued.

The other name, native well is, as a later explorer David Carnegie, author of Spinifex and Sand ( 1898 ), points out, a misnomer. He believes native wells are essentially rock-holes ( depressions in rock ) buried in fairly shallow sand, which, when hollowed out by the natives, appear to be wells.

Explorer David Carnegie believes native wells are rock-holes buried in shallow sand which, when hollowed out by natives, appear to be wells.

