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Rules for Decomposition to 2 NF

I am struggling with the concept of 2NF form. Lets say I have a set of functional dependencies for R1(A,B,C,D,E, H,M,K) Where :

B->M,C AB->D DH ->E H->K A->H

Whenever I try to decompose it, I directly get 3 NF tables. What are the rules to get something in 2 NF, with minimal set of tables ?

Now how do I take this further to 3 NF or BCNF?