Which one is different?

1. foot wrist toe ankle
1. foot
2. wrist
3. toe
4. ankle
2. arm hand wrist stomach
1. arm
2. hand
3. wrist
4. stomach
3. neck ears nose lips
1. neck
2. ears
3. nose
4. lips
4. cheeks finger chin hair
1. cheeks
2. finger
3. chin
4. hair
5. mouth teeth lips shoulder
1. mouth
2. teeth
3. lips
4. shoulder
6. eyes legs knees ankle
1. eyes
2. legs
3. knees
4. ankle
7. shoulder chest neck bottom
1. shoulder
2. chest
3. neck
4. bottom