anchor.diff:  0699999,"Nonmetropolitan, nonmicropolitan",M
   0814500,"Boulder, CO",M
   0814720,"Breckenridge, CO",M
  -0815860,"Caon City, CO",M
  +0815860,"Cañon City, CO",M
   0817820,"Colorado Springs, CO",M
   0818780,"Craig, CO",M
   0819740,"Denver-Aurora-Lakewood, CO",M
  
positive.code: 35007,"Colfax, NM",C
  35009,"Curry, NM",C
  35011,"De Baca, NM",C
  35013,"Doa Ana, NM",C
  35015,"Eddy, NM",C
  35017,"Grant, NM",C
  35019,"Guadalupe, NM",C
  
negative.code: 31860,"Mankato-North Mankato, MN",B
  31900,"Mansfield, OH",B
  31999,"Not in metropolitan area, NE",B
  32420,"Mayagüez, PR",B
  32580,"McAllen-Edinburg-Mission, TX",B
  32780,"Medford, OR",B
  32820,"Memphis, TN-MS-AR",B
  