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first cutter: trim (LEADING '.' FROM SUBSTRING (call_number, '\.{0,}[A-Z][0-9]{1,}'))
second cutter: trim (LEADING '.' FROM SUBSTRING (call_number, '\s{1}[A-Z]{1}\d{1,}x{0,}a{0,}b{0,}'))
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first cutter: trim (LEADING '.' FROM SUBSTRING (call_number, '\.{0,}[A-Z][0-9]{1,}'))
second cutter: trim (LEADING '.' FROM SUBSTRING (call_number, '\s{1}[A-Z]{1}\d{1,}x{0,}a{0,}b{0,}'))
...