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; This examples from WikiPedia <https://en.wikipedia.org/wiki/Augmented_Backus%E2%80%93Naur_Form>.
postal-address = name-part street zip-part
name-part = *(personal-part SP) last-name [SP suffix] CRLF
name-part =/ personal-part CRLF
personal-part = first-name / (initial ".")
first-name = *ALPHA
initial = ALPHA
last-name = *ALPHA
suffix = ("Jr." / "Sr." / 1*("I" / "V" / "X"))
street = [apt SP] house-num SP street-name CRLF
apt = 1*4DIGIT
house-num = 1*8(DIGIT / ALPHA)
street-name = 1*VCHAR
zip-part = town-name "," SP state 1*2SP zip-code CRLF
town-name = 1*(ALPHA / SP)
state = 2ALPHA
zip-code = 5DIGIT ["-" 4DIGIT]
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