input question: Fix spacing: TheModelKreplacedthestylishLmodel,whichhadappearedintheearly20's.

output answer: The Model K replaced the stylish L model, which had appeared in the early 20's.
Problem: Anotherdigestertypeismorecommon:theplugflowfermenter.
What's a sentence that uses these characters?
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Another digester type is more common: the plug flow fermenter.
Add spaces: Thesolution:shinesomelightonthefear.

Answer: The solution: shine some light on the fear.
WhentheTrackID™️applicationisopen,holdthephonetowardthemusicsource.

When the TrackID™️ application is open, hold the phone toward the music source.
[Q]: [FiledUnder:RecycleTaggedWith:plasticrecyclingnumbers,PolyvinylChloride]
[A]: [Filed Under: Recycle Tagged With: plastic recycling numbers, Polyvinyl Chloride]
Problem: Add spaces: 1949:TheGreekcivilwarendsandGreecebeginstoreceivemoreaidundertheMarshallPlan.

Spaces added:
1949: The Greek civil war ends and Greece begins to receive more aid under the Marshall Plan.