Please bear in mind that you pose an impossible question to answer accurately. The sequencing of postures is a very powerful tool, as are the postures themselves. Furthermore, they do not fit all human beings in the same way so what is important is not the asana but the human being doing them.
That having been said...
Adho Mukha Svanasana
Sirasana (Only when properly learned from contact with a teacher)
Sarvangasana (Only when properly learned from contact with a teacher)
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