These are in the rules, here's one form a scenario I'm working on:
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; Trading Commodities
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@Caravan
Lubricants,
Stronger Gears,
Inline Engines,
Radial Engines,
Rocket Engines,
Pulse-Jet Engines,
Jet Engines,
Swept Wings,
Radar Set,
ECM,
Rocket Fuels,
Jet Fuels,
Guided Missiles,
Decryptors...