Epi-Aristolochene, a hydrocarbon found in both pepper and tobacco, is biosynthesized by the following pathway. Add curved arrows to show the mechanism of each step. Which steps involve alkene electrophilic addition(s), and which involve carbocation rearrangement(s)? (The abbreviation H?A stands for an unspecified acid, and ?Base? is an unspecified base in the enzyme.)

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CHз CHз Н-А H3C (acid) Н Н Н Н сHз Н снз Base CHз CHз Н H. CHз CHз Н CHз epі-Aristolochene