What is a Blueprint (BP)?
You need nine (9) distinct Blueprints (aka a complete set) in order to construct a Great Building. The initial set of Blueprints will allow you to construct as well as level the Great Building up to Level 10. Thereafter, a complete set of Blueprints is required for every level.
Trading In Blueprints
You may trade in blueprints if you have an excess in one "stack" for a chance at receiving another in different "stack". The transaction requires two (2) Blueprints and will provide one (1) in return. To conduct the transaction, you must have at least one (1) remaining Blueprint in the "stack".
*** "Stack" of 3 ***
You can observe the excess of Blueprints in the above example as the bottom, right-hand "stack" has three (3) Blueprints.
*** "Stack" of 2 ***
You can observe the excess of Blueprints in the above example as the top-middle and top-right "stacks" have two (2) Blueprints.
Notes
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