~ for the hardness of ~ , 41_MAR_03_05 , 41_MAR_10_05 , 
~ for the hardness ~ , 41_MAR_03_05 , 41_MAR_10_05 , 
~ hardness of your ~ , 40_MAT_19_08 , 41_MAR_10_05 , 
~ the hardness of your ~ , 40_MAT_19_08 , 41_MAR_10_05 , 
~ the hardness of ~ , 40_MAT_19_08 , 41_MAR_03_05 , 41_MAR_10_05 ,