instruction:
In this task, you will be given a passage to read. A fill in the blank question will be given to you. Your answer should fit the blank appropriately.
question:
For addition of sulfur ylides to enones , higher 1 @,@ 4 @-@ selectivity is typically obtained with sulfoxonium reagents than with sulfonium reagents . Many electron @-@ withdrawing groups have been shown compatible with the reaction including ketones , esters , and amides ( the example below involves a Weinreb amide ) . With further conjugated systems 1 @,@ 6 @-@ addition tends to predominate over 1 @,@ 4 @-@ addition . fill in the blank : For addition of sulfur __________________ to enones , higher 1 @,@ 4 @-@ selectivity is typically obtained with sulfoxonium reagents than with sulfonium reagents .
answer:
ylides

question:
The game takes place during the Second Europan War . Gallian Army Squad 422 , also known as The Nameless , are a penal military unit composed of criminals , foreign deserters , and military offenders whose real names are erased from the records and thereon officially referred to by numbers . Ordered by the Gallian military to perform the most dangerous missions that the Regular Army and Militia will not do , they are nevertheless up to the task , exemplified by their motto , Altaha Abilia , meaning Always Ready . The three main characters are No.7 Kurt Irving , an army officer falsely accused of treason who wishes to redeem himself ; Ace No.1 Imca , a female Darcsen heavy weapons specialist who seeks revenge against the Valkyria who destroyed her home ; and No.13 Riela Marcellis , a seemingly jinxed young woman who is unknowingly a descendant of the Valkyria . Together with their fellow squad members , these three are tasked to fight against a mysterious Imperial unit known as Calamity Raven , consisting of mostly Darcsen soldiers .fill in the blank : The game takes place during the Second __________________ War .
answer:
Europan

question:
Regional airports , such as Edinburgh Airport , have experienced strong growth in CAT operations in recent years . These operations are commercially and operationally incompatible with GA , and although there is no evidence of deliberate discrimination , the effect has been to discourage or exclude it . GA aircraft are being subject to significant increases in charges , including the imposition of handling fees in some cases . Some airports restrict or deny GA parking , and others limit or refuse certain GA activity . As a result , light GA aircraft are now rarely or never seen at large , busy international airports such as Heathrow , Stansted , Gatwick and Manchester . In addition to this de facto loss of facilities , the number of aerodromes in the UK has been in decline over the last 50 years , as a result of increasing urbanisation and the closure of airfields built during WWII . Alternative and more profitable uses for land can also lead to existing aerodromes being threatened with closure , for example North Weald , or actually being closed , as happened to Ipswich Airport. and Bristol Filton Airport . Referring to the importance of a functioning national network of GA airfields , especially where GA performs an air transport role , the CAA states that there could be cause for concern if a significant further loss of airfields were to continue , especially if crucial nodes on the transport network were to be lost . fill in the blank : Regional airports , such as Edinburgh Airport , have experienced strong growth in CAT __________________ in recent years .
answer:
operations