-- 2010-05-11
UPDATE contacts SET custom_var12 = 'english_saturday_school' WHERE custom_var12 = 'saturday_school' ;

-- 2010-09-08
UPDATE contacts SET custom_var12 = 'saturday_school_english' WHERE custom_var12 = 'english_saturday_school' ;
UPDATE contacts SET custom_var12 = 'saturday_school_turkish' WHERE custom_var12 = 'turkish_saturday_school' ;