anchor.diff:  http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/frc/frc.aspx#.,,410
   http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/guid_ppd/guid_ppd.aspx,https://www.gov.uk/oil-and-gas-operatorship,301
   http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/habitats/habitats.aspx,https://www.gov.uk/oil-and-gas-offshore-environmental-legislation,301
  -http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/leg_guidance.aspx,https://www.gov.uk/oil-and-gas-offshore-environmental-legislation#the-energy-act-2008-part-4a-consent-to-locate,301
  +http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/leg_guidance.aspx,https://www.gov.uk/oil-and-gas-offshore-environmental-legislation,301
   http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/mercury/mercury.aspx,https://www.gov.uk/oil-and-gas-legislation-on-emissions-and-releases,301
   http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/msf/msf.aspx,,410
   http://og.decc.gov.uk/en/olgs/cms/environment/leg_guidance/ocr/ocr.aspx,https://www.gov.uk/oil-and-gas-offshore-environmental-legislation,301
  
positive.code: http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/,,410
  http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/fallow_blocks/,,410
  http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/fallow_blocks/fallow_blocks.,,410
  http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/fallow_blocks/fallow_blocks.aspx,https://www.gov.uk/oil-and-gas-fallow-blocks-and-discoveries,301
  http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/fallow_blocks/fallow_blocks/,,410
  http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/geoscientific/geoscientific.aspx,https://www.gov.uk/oil-and-gas-geoscientific-data,301
  http://og.decc.gov.uk/en/olgs/cms/bus_opps/uk_promote/practices/practices.aspx,,410
  
negative.code: http://og.decc.gov.uk/en/olgs/cms/data_maps/data_maps/data_release/data_/data_.aspx,,410
  http://og.decc.gov.uk/en/olgs/cms/data_maps/data_release/data_/data_.aspx,https://www.gov.uk/oil-and-gas-digital-data-exchange-format,301
  http://og.decc.gov.uk/en/olgs/cms/data_maps/data_release/data_/en/olgs/cms/explorationpro/wells/stratigraphy/stratigraphy.aspx,,410
  http://og.decc.gov.uk/en/olgs/cms/data_maps/data_release/data_purchase_/data_purchase_.aspx,http://tools.decc.gov.uk/en/content/cms/data_release/data_purchase_/data_purchase_.aspx,301
  http://og.decc.gov.uk/en/olgs/cms/data_maps/data_release/data_purchase_/en/olgs/cms/explorationpro/wells/stratigraphy/stratigraphy.aspx,,410
  http://og.decc.gov.uk/en/olgs/cms/data_maps/data_release/data_release.a%20spx,,410
  http://og.decc.gov.uk/en/olgs/cms/data_maps/data_release/data_release.aspx,http://tools.decc.gov.uk/en/content/cms/data_release/%20data_release.aspx,301
  http://og.decc.gov.uk/en/olgs/cms/data_maps/data_release/data_viewing/data_viewing.aspx,https://www.gov.uk/oil-and-gas-digital-data-exchange-format,301
  http://og.decc.gov.uk/en/olgs/cms/data_maps/data_release/data_viewing/en/olgs/cms/explorationpro/wells/stratigraphy/stratigraphy.aspx,,410
  http://og.decc.gov.uk/en/olgs/cms/data_maps/data_release/en/olgs/cms/explorationpro/wells/stratigraphy/stratigraphy.aspx,,410
  