*Rebuilt the AllMatchc20 tables. New names are Combo..._Code20.
**Crucial difference: Only investments within ComboKeys_Code20 are included in the history counts. Before anything in RLJoinerFF or even RoundlineBase were included, which created the impression of overcounts.
**The vast majority of missing distances are were caused by missing firm addresses for just 391 VCs. However, we have zip codes for almost all (?) of them. I build firmbogeoplus (see [[VCDB20]]) to add in zcta centroids from the U.S. Census gazetteer where available. However, 47 zips weren't in the ZCTA lookup, and they account for 113 firms that participated in 3,997 pairs (real and synth).