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Use "keyers" in a sentence
"Postal service and shipping clerks, data entry keyers, ticket agents and special education teachers."
"(No electronic keyers and no 15 metre band in those years)."
"ATEM also combines powerful features such as SuperSource, which is a separate multi-layer engine with 4 x 2D picture in picture DVE's and 4 x keyers that provide the same power as adding a whole extra multiple M/E switcher to the ATEM input."