The diagrams show the structures of two forms, P and Q, of a solid element.
What are suitable uses of P and Q, based on their structures?

1 )
use of solid P: drilling / use of solid Q: drilling
2 )
use of solid P: drilling / use of solid Q: lubricating
use of solid P: lubricating / use of solid Q: drilling
4 )
use of solid P: lubricating / use of solid Q: lubricating
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