instruction:
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.
question:
From lanthanum ( 57 ) to lutetium ( 71 )
answer:
The lanthanide elements are the group of elements with atomic number increasing from 57 ( lanthanum ) to 71 ( lutetium ) .


question:
An IATA airport code , is a three-letter code that can be used to identify airports .
answer:
An IATA airport code , also known as an IATA location identifier , IATA station code or simply a location identifier , is a three-letter code designating many airports and metropolitan areas around the world , defined by the International Air Transport Association ( IATA ) .


question:
There are many Russian language schools in London and the South East .
answer:

In London and the South East there are a number of Russian schools aimed at transmitting Russian language and culture to the children of Russian immigrant parents .