查1716康熙55年板《康熙字典》
1. [欵] 款之俗字
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(facebook書頁)
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2. [欵] 及 [欸乃]
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(facebook書頁)
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3. [款]
3-1
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(facebook書頁)
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3-2
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(facebook書頁)
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3-3 康熙字典無此誤混, 而且指明「款乃」為非!
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(facebook書頁)
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故宮【寒泉】古典文獻全文檢索資料庫
全 唐 詩 中有一筆 「款乃」應為[欸乃]被誤為[欵乃]而成[款乃]吧!?
http://libnt.npm.gov.tw/s25/
款乃曲五首 元結