Actually, there are very metal-poorstars (subdwarfs[?]) that lie just below the mainsequence although they are fusing hydrogen, thus marking the lower edge of the mainsequence's fuzzyness due to chemical compositon.
Stars usually enter and leave the mainsequence from above when they are born or they are starting to die, respectively.
In the lower-left is where white dwarfs are found, and above the mainsequence are the red giants and supergiants.
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