QUESTION: Fix punctuation: backrest 10 times from negative to right angle
ANS: backrest: 10 times from negative to right angle

QUESTION: Fix punctuation: screaming Japanese creampie hairy
ANS: screaming, Japanese, creampie, hairy

QUESTION: Fix punctuation: Oil is a mixture of different carbon chains and to separate them from each other the oil must be heated
ANS: Oil is a mixture of different carbon chains, and to separate them from each other, the oil must be heated.

QUESTION: Fix punctuation: There is much that other Open Source developers as well as developers of commercial software may be learn from this project
ANS:
There is much that other Open Source developers as well as developers of commercial software may be learn from this project.