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direct operating expense
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direct operating expense
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flat rate
flat rate of negotiation
flat reaming head
flat rectangular element
flat reflector
flat region
flat relay
flat relief
flat repeater
flat response
flat-response counter
flat response curve
flat retractor
flat ribbon
flat ribbon cable
flat ribbon connector
flat rib top machine
flat riffle
flat rim
flat ring dynamo
flat-riser
flat rivet head
flat roadway
flat rod
flat roll
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