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| continuous tone | |||
| continuous tones | |||
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| Long tones (A setting for the phone keyboard that causes a key to continue to produce a tone as long as the key is pressed) | |||
| tono continuo: 6 phrases in 4 subjects |
| Communications | 2 |
| Electronics | 2 |
| General | 1 |
| Life sciences | 1 |