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Words (16 bits to the study of the Orbiter avionics subsystems. 4-39 ORBITER GUIDANCE, NAVIGATION, AND CONTROL б ОҒ PLANETARY тес ORBITER DATA VOICE COORDINATION PAYLOAD COMMAND THROUGH ORBITER/IUS, AIR-TO-GROUND VOICE AIR-TO-GROUND VOICE AIR-TO-GROUND VOICE PAYLOAD COMMAND AIR-TO-GROUND VOICE PAYLOAD COMMAND THROUGH ORBITER/IUS, AIR-TO-GROUND VOICE AIR-TO-GROUND VOICE ORBITER DATA, VOICE COORDINATION PAYLOAD COMMAND AIR-TO-GROUND VOICE ORBITER DATA.