The invention disclosed some 1,4-dihydropiridine derivative chemically with guaiacoxypropanolamine based phenoxypropanolamine moiety and pharmacologically with -adrenoceptor blocking and partial 2-agonist activities, is now emerging. The lace extends through a series of guide members positioned along two opposing footwear closure portions. The classification module is also configured to classify the user to an identified user type based on the classification score. If the searching-user locates a prospect-user whom the searching-user thinks may be of interest to the searching-user’s friend or associate, the searching-user may recommend that person to the prospect-user. The system further encodes the first and the second adjusted key field entries based on index keys to generate an encrypted database.