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all types specified in the "substrate" statement, split such types into those on the declared well plane, and everything else. Any types on the well plane are searched as before. Types not on the well plane (e.g., psd on active) are searched and added to the substrate node *only* if overlapping nothing on the well plane. This allows a type such as "psd" to be used on, e.g., both space (substrate) and deep pwell, but only be extracted as part of the substrate when found over space. Note that if there is NO implicit substrate, the substrate connections will always be found through the usual connection rules.