(
  ($duration
   $wage-increase-first-year
   $wage-increase-second-year
   $wage-increase-third-year
   cost-of-living-adjustment 
   $working-hours
   pension
   $standby-pay
   $shift-differential
   education-allowance 
   $statutory-holidays
   vacation
   longterm-disability-assistance
   contribution-to-dental-plan
   bereavement-assistance
   contribution-to-health-plan 
   !class)
  (1 5 ? ? ? 40 ? ? 2 ? 11 average ? ? yes ? good)
  (2 4.5 5.8 ? ? 35 ret_allw ? ? yes 11 below_average ? full ? full good)
  (? ? ? ? ? 38 empl_contr ? 5 ? 11 generous yes half yes half good)
  (3 3.7 4 5 tc ? ? ? ? yes ? ? ? ? yes ? good)
  (3 4.5 4.5 5 ? 40 ? ? ? ? 12 average ? half yes half good)
  (2 2 2.5 ? ? 35 ? ? 6 yes 12 average ? ? ? ? good)
  (3 4 5 5 tc ? empl_contr ? ? ? 12 generous yes none yes half good)
  (3 6.9 4.8 2.3 ? 40 ? ? 3 ? 12 below_average ? ? ? ? good)
  (2 3 7 ? ? 38 ? 12 25 yes 11 below_average yes half yes ? good)
  (1 5.7 ? ? none 40 empl_contr ? 4 ? 11 generous yes full ? ? good)
  (3 3.5 4 4.6 none 36 ? ? 3 ? 13 generous ? ? yes full good)
  (2 6.4 6.4 ? ? 38 ? ? 4 ? 15 ? ? full ? ? good)
  (2 3.5 4 ? none 40 ? ? 2 no 10 below_average no half ? half bad)
  (3 3.5 4 5.1 tcf 37 ? ? 4 ? 13 generous ? full yes full good)
  (1 3 ? ? none 36 ? ? 10 no 11 generous ? ? ? ? good)
  (2 4.5 4 ? none 37 empl_contr ? ? ? 11 average ? full yes ? good)
  (1 2.8 ? ? ? 35 ? ? 2 ? 12 below_average ? ? ? ? good)
  (1 2.1 ? ? tc 40 ret_allw 2 3 no 9 below_average yes half ? none bad)
  (1 2 ? ? none 38 none ? ? yes 11 average no none no none bad)
  (2 4 5 ? tcf 35 ? 13 5 ? 15 generous ? ? ? ? good)
  (2 4.3 4.4 ? ? 38 ? ? 4 ? 12 generous ? full ? full good)
  (2 2.5 3 ? ? 40 none ? ? ? 11 below_average ? ? ? ? bad)
  (3 3.5 4 4.6 tcf 27 ? ? ? ? ? ? ? ? ? ? good)
  (2 4.5 4 ? ? 40 ? ? 4 ? 10 generous ? half ? full good)
  (1 6 ? ? ? 38 ? 8 3 ? 9 generous ? ? ? ? good)
  (3 2 2 2 none 40 none ? ? ? 10 below_average ? half yes full bad)
  (2 4.5 4.5 ? tcf ? ? ? ? yes 10 below_average yes none ? half good)
  (2 3 3 ? none 33 ? ? ? yes 12 generous ? ? yes full good)
  (2 5 4 ? none 37 ? ? 5 no 11 below_average yes full yes full good)
  (3 2 2.5 ? ? 35 none ? ? ? 10 average ? ? yes full bad)
  (3 4.5 4.5 5 none 40 ? ? ? no 11 average ? half ? ? good)
  (3 3 2 2.5 tc 40 none ? 5 no 10 below_average yes half yes full bad)
  (2 2.5 2.5 ? ? 38 empl_contr ? ? ? 10 average ? ? ? ? bad)
  (2 4 5 ? none 40 none ? 3 no 10 below_average no none ? none bad)
  (3 2 2.5 2.1 tc 40 none 2 1 no 10 below_average no half yes full bad)
  (2 2 2 ? none 40 none ? ? no 11 average yes none yes full bad)
  (1 2 ? ? tc 40 ret_allw 4 0 no 11 generous no none no none bad)
  (1 2.8 ? ? none 38 empl_contr 2 3 no 9 below_average yes half ? none bad)
  (3 2 2.5 2 ? 37 empl_contr ? ? ? 10 average ? ? yes none bad)
  (2 4.5 4 ? none 40 ? ? 4 ? 12 average yes full yes half good)
  (1 4 ? ? none ? none ? ? yes 11 average no none no none bad)
  (2 2 3 ? none 38 empl_contr ? ? yes 12 generous yes none yes full bad)
  (2 2.5 2.5 ? tc 39 empl_contr ? ? ? 12 average ? ? yes ? bad)
  (2 2.5 3 ? tcf 40 none ? ? ? 11 below_average ? ? yes ? bad)
  (2 4 4 ? none 40 none ? 3 ? 10 below_average no none ? none bad)
  (2 4.5 4 ? ? 40 ? ? 2 no 10 below_average no half ? half bad)
  (2 4.5 4 ? none 40 ? ? 5 ? 11 average ? full yes full good)
  (2 4.6 4.6 ? tcf 38 ? ? ? ? ? ? yes half ? half good)
  (2 5 4.5 ? none 38 ? 14 5 ? 11 below_average yes ? ? full good)
  (2 5.7 4.5 ? none 40 ret_allw ? ? ? 11 average yes full yes full good)
  (2 7 5.3 ? ? ? ? ? ? ? 11 ? yes full ? ? good)
  (3 2 3 ? tcf ? empl_contr ? ? yes ? ? yes half yes ? good)
  (3 3.5 4 4.5 tcf 35 ? ? ? ? 13 generous ? ? yes full good)
  (3 4 3.5 ? none 40 empl_contr ? 6 ? 11 average yes full ? full good)
  (3 5 4.4 ? none 38 empl_contr 10 6 ? 11 generous yes ? ? full good)
  (3 5 5 5 ? 40 ? ? ? ? 12 average ? half yes half good)
  (3 6 6 4 ? 35 ? ? 14 ? 9 generous yes full yes full good)
  )