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David Maus authored
* src/HAB/Pica/Record/Subfield.php ($validSubfieldCodePattern): New property. (isValidSubfieldCode): Factor out subfield code pattern.
f670b474
* src/HAB/Pica/Record/Subfield.php ($validSubfieldCodePattern): New property. (isValidSubfieldCode): Factor out subfield code pattern.