id # medium Smooth Wrinkled 1 1 LowpH 6 18 2 1 LowpH 6 36 3 1 LowpH 15 16 4 1 LowpH 3 29 5 1 Normal 16 2 6 1 Normal 10 5 7 1 Normal 21 1 8 1 Normal 16 2 9 2 LowpH 13 19 10 2 LowpH 27 28 11 2 LowpH 12 16 12 2 LowpH 14 25 13 2 LowpH 17 24 14 2 Normal 33 6 15 2 Normal 31 7 16 2 Normal 34 3 17 2 Normal 37 14 18 2 Normal 52 7