what is a phone extension number（関連順）

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𝐈𝐧𝐭𝐞𝐫𝐜𝐨𝐦𝐞 𝐥𝐢𝐧𝐞 𝐞𝐱𝐭𝐞𝐧𝐬𝐢𝐨𝐧 𝐧𝐮𝐦𝐛𝐞𝐫 𝐩𝐫𝐨𝐠𝐫𝐚𝐦𝐦𝐢𝐧𝐠(𝟏) | 𝐏𝐚𝐧𝐚𝐬𝐨𝐧𝐢𝐜 𝐓𝐞𝐥𝐞𝐩𝐡𝐨𝐧𝐞 𝐬𝐞𝐭𝐭𝐢𝐧𝐠 | 𝐊𝐗 @FlowChart

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結果 : what is a phone extension number