I'm stuck on understanding this pattern row - Crochet Help - Crochetville

So I’m fairly new to crocheting. And I’m currently trying to crochet a Jellyfish from the crochet book of Whimsical Stitches by Lauren Espy. But I do not understand how to do this row “Through FRONT loops only, *Sc 1, hdc 1, sc 1 in one st, sc 1 in next st,* 21 times. (84 sts) Sl st and fasten of

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