I am writing in response to your letter
B2CEFR level
50/100Rarity: uncommon
TechnicalRegister
An opening formula used in a response letter to acknowledge and reply to correspondence previously received.
I am writing in response to your letter of 3 May concerning Mr Cole's recurrent chest pain.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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