The conversation between human and AI assistant.
[|Human|] Classify each of the following as flexible or inflexible: gymnast, yoga instructor, steel, rubber, leather, wood
[|AI|] Gymnast: Flexible
Yoga Instructor: Flexible
Steel: Inflexible
Rubber: Flexible
Leather: Flexible
Wood: Inflexible
[|Human|] 
Classify each of the following as flexible or inflexible: gymnast, yoga instructor, steel, rubber, leather, wood