anchor.diff:  http://www.direct.gov.uk/en/Diol1/DoItOnline/DG_201704,301,https://www.gov.uk/browse/working/finding-job
   http://www.direct.gov.uk/prod_consum_dg/groups/dg_digitalassets/@dg/@en/documents/digitalasset/dg_200090.html?PRO=hp&CRE=pop,301,https://www.gov.uk/jobseekers-allowance
   http://www.direct.gov.uk/en/YoungPeople/index.htm,301,https://www.gov.uk/
  -http://www.direct.gov.uk/en/Motoring/OwningAVehicle/HowToTaxYourVehicle/DG_10036328,301,https://www.gov.uk/car-tax-disc-vehicle-licence
  +http://www.direct.gov.uk/en/Motoring/OwningAVehicle/HowToTaxYourVehicle/DG_10036328,301,https://www.gov.uk/browse/driving/car-tax-discs
   http://www.direct.gov.uk/en/Employment/Jobseekers/Helpapplyingforajob/DG_173655,410,
   http://www.direct.gov.uk/en/MoneyTaxAndBenefits/TaxCredits/index.htm,301,https://www.gov.uk/browse/benefits/tax-credits
   http://www.direct.gov.uk/en/Motoring/DriverLicensing/WhatCanYouDriveAndYourObligations/DG_4022547,301,https://www.gov.uk/vehicles-you-can-drive
   http://www.direct.gov.uk/en/EducationAndLearning/UniversityAndHigherEducation/StudentFinance/DG_200488,301,https://www.gov.uk/student-finance-for-existing-students
  -http://www.direct.gov.uk/en/EducationAndLearning/UniversityAndHigherEducation/StudentFinance/Typesoffinance/DG_171557,301,https://www.gov.uk/apply-for-student-finance-2012-13
  +http://www.direct.gov.uk/en/EducationAndLearning/UniversityAndHigherEducation/StudentFinance/Typesoffinance/DG_171557,301,https://www.gov.uk/student-finance
   http://www.direct.gov.uk/en/Motoring/Motoringtransactions/BeforeyouapplyD/DG_193810,301,https://www.gov.uk/change-photo-driving-licence
   http://www.direct.gov.uk/en/MoneyTaxAndBenefits/BenefitsTaxCreditsAndOtherSupport/Illorinjured/DG_10018786,301,https://www.gov.uk/statutory-sick-pay-ssp
   http://www.direct.gov.uk/en/Motoring/BuyingAndSellingAVehicle/AdviceOnBuyingAndSellingAVehicle/DG_10014436,301,https://www.gov.uk/get-vehicle-information-from-dvla
  
positive.code: http://www.direct.gov.uk/en/Pensionsandretirementplanning/StatePension/DG_184319,301,https://www.gov.uk/browse/working/state-pension
  http://www.direct.gov.uk/en/Motoring/LearnerAndNewDrivers/PracticalTest/index.htm,301,https://www.gov.uk/browse/driving/learning-to-drive
  http://www.direct.gov.uk/en/Motoring/DriverLicensing/index.htm,301,https://www.gov.uk/browse/driving/driving-licences
  http://www.direct.gov.uk/en/DisabledPeople/index.htm,301,https://www.gov.uk/
  http://www.direct.gov.uk/en/Motoring/Motoringtransactions/BeforeyouapplyC/DG_193809,301,https://www.gov.uk/change-photo-driving-licence
  http://www.direct.gov.uk/en/Motoring/OwningAVehicle/HowToTaxYourVehicle/DG_4022118,301,https://www.gov.uk/calculate-vehicle-tax-rates
  http://www.direct.gov.uk/en/TravelAndTransport/Passports/howlongittakesandurgentappplications/index.htm,301,https://www.gov.uk/passport-fees
  
negative.code: http://www.direct.gov.uk/en/CrimeJusticeAndTheLaw/index.htm,301,https://www.gov.uk/browse/justice
  http://www.direct.gov.uk/en/MoneyTaxAndBenefits/BenefitsTaxCreditsAndOtherSupport/BeginnersGuideToBenefits/DG_4016805,301,https://www.gov.uk/benefits-adviser
  http://www.direct.gov.uk/en/Parents/index.htm,301,https://www.gov.uk
  http://www.direct.gov.uk/en/MoneyTaxAndBenefits/BenefitsTaxCreditsAndOtherSupport/Illorinjured/DG_171896,301,https://www.gov.uk/employment-support-allowance/what-youll-get
  http://www.direct.gov.uk/en/MoneyTaxAndBenefits/TaxCredits/Gettingstarted/whoqualifies/DG_181268,301,https://www.gov.uk/qualify-tax-credits-quick-questionnaire
  http://www.direct.gov.uk/en/Pensionsandretirementplanning/Benefits/BenefitsInRetirement/DG_10018657,301,https://www.gov.uk/winter-fuel-payment
  http://www.direct.gov.uk/en/Employment/RedundancyAndLeavingYourJob/Redundancy/DG_174330,301,https://www.gov.uk/calculate-your-redundancy-pay
  