Puzzle 14

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ClueSolution
it swims with sharksPILOTFISH
PILOTFISH
including a file in an emailATTACHING
ATTACHING
like summer vis-à-vis winterHOTTER
HOTTER
follows the rulesOBEYS
OBEYS
number 4 on the Mohs scaleFLUORITE
FLUORITE
makes flawlessPERFECTS
PERFECTS
very angrilyFURIOUSLY
FURIOUSLY