repeat

• if current node is full (i.e. contains 3 items)
  • split into two 2-nodes
  • promote middle element to parent
    • if no parent ⇒ middle element becomes the new root 2-node
  • go back to parent node
• if current node is a leaf
  • insert Item in this node, degree++
• if current node is not a leaf
  • go to child where Item belongs