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[i]We had to scrub ISEE-3 spin-up burn for today. We can't confirm receipt of commands in real time by the spacecraft. If we cannot confirm that proper commands were sent to the propulsion system we cannot fire thrusters with full confidence. Remember: this spacecraft does not have a computer. All 21 dummy commands worked — that should NOT have happened. Next time we sent them only three were accepted. Investigating...[/i]
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