Very sorry to contradit you on this one.
You need at least one trade rule. (But that's a given)
However, You can abolish all the other rules in a region.
Small Example: if you play in Garden(open rule) then play in Timber(same rule), you can have two things beside nothing.
1-Open rule has spread in this region
2-Same rule has abolished in this region
If Timber doesn't have the same rule anymore.
Then it's nothing and one card trade rule.
This process may take some time and alot of restart.




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