input question: Fix spacing: Commonsoundsrarelyriseabove40dB.

output answer: Common sounds rarely rise above 40 dB.
Problem: Brochuresarethe"littlesisters"ofcatalogs;abound,printedproductwithupto64pages,withorwithoutcover,asdesired.
What's a sentence that uses these characters?
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Brochures are the "little sisters" of catalogs; a bound, printed product with up to 64 pages, with or without cover, as desired.
Add spaces: ThecauseofLCTisunknown,butaretainedtesticle(usuallyintheabdomen)maypredisposeananimaltoLeydigcelltumorformation.

Answer: The cause of LCT is unknown, but a retained testicle (usually in the abdomen) may predispose an animal to Leydig cell tumor formation.
Whenpiecemeasures18-20cm,workinstockingstwithdarkgreybluewhileATTHESAMETIMEdecasfollows:

When piece measures 18-20 cm, work in stocking st with dark grey blue while AT THE SAME TIME dec as follows:
[Q]: [Andyoucangettheanswerstoallofyourburningquestions:doapeshavemorals?Whatdoweknowabouttheoriginoflife?Howhasmanevolved?]
[A]: [And you can get the answers to all of your burning questions: do apes have morals? What do we know about the origin of life? How has man evolved?]
Problem: Add spaces: MicrosoftisconstantlyupdatingandimprovingWindowssystemfilesthatcouldbeassociatedwithbvd60hpo.exe.

Spaces added:
Microsoft is constantly updating and improving Windows system files that could be associated with bvd60hpo.exe.