Here's a basic Terran build order for a 2-base push with early Hellion harass in StarCraft 2. Keep in mind that this build order may not be optimal, as it's important to adapt your strategy to your opponent and the specific game conditions. This build assumes you're starting with the standard 12 workers:

1. 14 Supply Depot
1. 16 Barracks
1. 16 Refinery
1. 17 Scout with an SCV
1. 19 Orbital Command (after the Barracks is completed)
1. 19 Reaper (from the Barracks)
1. 20 Command Center (natural expansion)
1. 20 Supply Depot
1. 21 Factory
1. 22 Refinery (second gas)
1. @100% Factory, start the Hellion production and a Reactor on the Barracks
1. 26 Starport
1. @100% Reactor, swap the Factory onto the Reactor for fast Hellion production
1. @100% Starport, start a Medivac or Liberator for additional harassment
1. Produce Hellions up to 6-8 for early harass
1. 36 Engineering Bay for upgrades
1. 40 Supply Depot (keep building Supply Depots as needed)
1. Transition into additional Barracks, Factories, or Starports for your preferred mid-game composition.

Keep building SCVs continuously until you have fully saturated your two bases (around 44-46 workers). Remember to scout your opponent and adapt your strategy as needed. Start your attack when you have a decent number of Hellions (6-8) and your Medivac or Liberator for additional harassment. Use the Hellions to harass mineral lines and scout, and try to keep them alive for the upcoming 2-base push. Keep producing units and upgrades during the harass, and execute your main push when you have a strong enough army.
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