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I have this instructions. How can write them in LaTeX?

f1 = |S_F_H|,    f2= |N_S_L|,   f3= |S_F_G|, f4= ||D|| -  ||D’||,
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    Please clarify what the _ character in S_F_H and elsewhere is supposed to mean: A subscript initiator? A literal underscore character? Something else?
    – Mico
    Dec 15 '20 at 18:18

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