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Acoustic
| Optical
| acoustic | |
| abbr. | acst |
| OPTIC | |
| abbr. | Optical Properties Technical Information Center |
| abbr. el. | optical procedural task instruction compiler |
| optical | |
| abbr. | o |
| abbr. adv. | optical effect |
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| acst | |||
| a | |||
| Acoustic: 1 phrase in 1 subject |
| Abbreviation | 1 |