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Answer:
While it is possible for literature on a particular topic of research to be scarce or even unavailable, I would like to suggest that literature that is almost relevant could be reviewed. The unavailability of prefect relevant literature should not be a yardstick for failing to review literature. How will readers know that actually, relevant literature is not available? It is when your review shows sequence of works carried out in the area and where the works end ( maybe close to what you need, but never what you need). Then, your work comes in uniquely.
Explanation: