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I'm writing to find out more _______ about...
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If I can offer any further ______, please do not hesitate to contact me.
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I was _____ if you could...
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_____ your call, ...
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I look ______ to hearing from you.
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Kind _____ .
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_____ to our earlier conversation,...
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Dear Sir or ______
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Great to hear ____ you again!
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If you need any more info, just ___ me know.