anchor.diff:            ai => ai.tile.openstreetmap.org.
             al => al.tile.openstreetmap.org.
             am => am.tile.openstreetmap.org.
  +          an => an.tile.openstreetmap.org.
             ao => ao.tile.openstreetmap.org.
  +          ap => ap.tile.openstreetmap.org.
             aq => aq.tile.openstreetmap.org.
             ar => ar.tile.openstreetmap.org.
             as => as.tile.openstreetmap.org.
  
positive.code:             SY => [sy]
              TH => [th]
              TJ => [tj]
              TM => [tm]
              TR => [tr]
              TW => [tw]
              UZ => [uz]
              VN => [vn]
  
negative.code:           bm => bm.tile.openstreetmap.org.
            bn => bn.tile.openstreetmap.org.
            bo => bo.tile.openstreetmap.org.
            br => br.tile.openstreetmap.org.
            bs => bs.tile.openstreetmap.org.
            bt => bt.tile.openstreetmap.org.
  