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0 ;; parent
0/1 ;; parent/self
/0 ;; parent/self(omitted parent)
/0,1 ;; parent/self,sibling(omitted parent)
0/1/2 ;; parent/self/first-child
//0 ;; parent/self/first-child(omitted parent and self)
//0,0 ;; two children are the same(teapot,teapot)
/0/0 ;; self and first child is the same(teapot/teapot)
/0 /0,name ;; Create name
/0,name /0 ;; Destroy name
0/1,name 0/name/1 ;; enter name
0/1,name 0/1/name ;; take name
0/1/name 0/1,name ;; drop name
0/1,name 0/name,1 ;; become name
0/1 0,1 ;; leave