Re:
A2CEFR level
10/100Rarity: common
TechnicalRegister
The subject line placed above the letter body to identify the patient, typically giving name, date of birth and address.
Re: Mrs Dorothy Wells, DOB 14/02/1948, 12 Elm Road.
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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