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private branch exchange--private branch exchange (PBX)
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flat coast
flat colour
flat commission
flat commission
flat commission
flat computer
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flat diaphragm
flat die forging
flat dipping bed
flat dollar benefit
flat-down fare
flat duck
flat epithelial cell
flat extra premium
flat face
flat-faced screen
flat fading
flat fading channel
flat fare
flat fee
flat feed dog
flat feed spring
flat-field lens
flat-field objective
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