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Sequence of very high-pitched, fast, digital tones, as if data are being processed.
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Quick ascending sequence of fast high pitched digital tones
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Succession of two fast low pitched beeps
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Pressing clicky and plasticky calculator buttons, fast
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Fast digital high pitched beeps as data is being processed
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Typing quickly on a calculator
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Pressing several plastic calculator buttons
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Pressing a calculator button
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Sequence of fast medium pitched beeps
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Digital, high-pitched bleeps.