In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.

[Q]: Cygnus X-1 was the first X-ray source accepted as a black hole .
[A]: Cygnus X-1 ( abbreviated Cyg X-1 ) is a galactic X-ray source in the constellation Cygnus , and the first such source widely accepted to be a black hole .


[Q]: The London , Brighton and South Coast Railway ( LBSCR was a railway company in England from 1846 to 1922 .
[A]: The London , Brighton and South Coast Railway ( LB & SCR ; known also as " the Brighton line " , " the Brighton Railway " or " the Brighton " ) was a railway company in the United Kingdom from 1846 to 1922 .


[Q]: The Caesar Cipher is also known as the shift cipher .
[A]:
In cryptography , a Caesar cipher , also known as Caesar 's cipher , the shift cipher , Caesar 's code or Caesar shift , is one of the simplest and most widely known encryption techniques .