anchor.diff:            cr => cr.tile.openstreetmap.org.
             cu => cu.tile.openstreetmap.org.
             cv => cv.tile.openstreetmap.org.
  -          cw => cw.tile.openstreetmap.org.
             cx => cx.tile.openstreetmap.org.
             cy => cy.tile.openstreetmap.org.
             cz => cz.tile.openstreetmap.org.
  
positive.code:             CC => [cc]
              CN => [cn]
              CX => [cx]
              GE => [ge]
              HK => [hk]
              ID => [id]
  
negative.code:             BG => [bg]
              BY => [by]
              CH => [ch]
              CZ => [cz]
              DE => [de]
              DK => [dk]
              EE => [ee]
              ES => [es]
              EU => [eu]
              FI => [fi]
              FO => [fo]
              FR => [fr]
              FX => [fx]
              GB => [gb]
              GG => [gg]
              GI => [gi]
  