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ＲＤＤ
あーる゛でぃー゛でぃー
[aaru゛dii゛dii]
Definitions
1.
noun (common) (futsuumeishi)
random digit dialing; RDD
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ＲＤＤ (あーる゛でぃー゛でぃー) — Definition | NichiDict