Question: Rationalize the indicated fragments in the EI mass spectrum of each of the following molecules by proposing a structure of the fragment and a mechanism

Rationalize the indicated fragments in the EI mass spectrum of each of the following molecules by proposing a structure of the fragment and a mechanism by which it is produced.
(a) 3-methyl-3-hexanol, m/z = 73
(b) Neopentane, m/z = 57

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