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create/remove some function which needs or doesn't need (chair (which…

- - - - which functions? which design? how?
        
        need to consider the age of the person who uses this chair
        
        explanation (why?) :
        
        explanation (how?) :
        
        thinking
        
        can cover the waist line
        
        explanation (why?) :
        
        explanation (how?) :
  - - - which functions? which design? how?
        
        makes a noise or some scratch on the floor
        
        explanation (why?) :
        
        explanation (how?) :
        
        doesn't have a backside so can't lean to the chair
        
        explanation (why?) :
        
        explanation (how?) :
        
        doesn't need so much cotton inside of the chair
        
        explanation (why?) :
        
        explanation (how?) :
- - - - which function? which design? how?
        
        how many object does it cover?
        
        special (extra) functions
        
        I am going to make some function which helps to carry the pencil case easily.
        
        thinking
        
        is it portative?
  - - - which function? which design? how?
        
        sometimes sharp things stick my body through the pencil case. so I am going to prevent it.
        
        still thinking
        
        not so big, not so small just proper size to use.