4 questions on "OSPF - OSPF Database Exchange - OSPF Neighbor States"

What is the attempt and init state function in OSPF?
a hello packet is received, but its router-id is not in the list of seen routers. So this routers does not know if the neighbor has heart its sent hello packet
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What is the function of the 2-way state?
If a hello packet is received with its own router-id in the list of seen routers. This state confirms a bi-directional visibility between two routers. The 2-way state is a stable state between routers on a multiaccess network that do not intend to become fully adjecent.
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What is the function of the exstart state?
If decided that the two routers have to become adjecent, they enter the exstart state. The purpose is to establish a master/slave relationship. They compare router-id and agree on a common starting sequence number used to acknowledge subsequent database description packets
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What is the function of the exchange state?
DD packets are exchanged between the neighbors carrying the list of link-state database elements (lsa). During this state each router builds a list of LSAs to be subsequently download from the other router
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