command> ['result'] = ['current'] = []
reference_concept returned 0
command> ['test'] = []
reference_concept returned 0
command> ['test'] ~ {[sky]->[blue]}*{[time]->[day]}*{[weather]->[nice]}
  {[sky]->[blue]}
  ({[sky]->[blue]}*{[time]->[day]}*{[weather]->[nice]})
  [sky]
  [blue]
  [time]
  [day]
  [nice]
  {[time]->[day]}
  [weather]
  {[weather]->[nice]}
command> ['test'] ~ {[sky]->[black]}*{[time]->[night]}
  {[sky]->[blue]}
  ({[sky]->[blue]}*{[time]->[day]}*{[weather]->[nice]})
  {[sky]->[black]}
  x2 [sky]
  [blue]
  x2 [time]
  [day]
  [night]
  [nice]
  {[time]->[day]}
  {[time]->[night]}
  [weather]
  {[weather]->[nice]}
  [black]
  ({[sky]->[black]}*{[time]->[night]})
command> ['test'] ~ {[sky]->[grey]}*{[time]->[day]}*{[weather]->[bad]}
  {[sky]->[blue]}
  ({[sky]->[blue]}*{[time]->[day]}*{[weather]->[nice]})
  {[sky]->[black]}
  x3 [sky]
  [blue]
  x3 [time]
  x2 [day]
  [night]
  [nice]
  x2 {[time]->[day]}
  {[time]->[night]}
  x2 [weather]
  ({[time]->[day]}*{[weather]->[bad]}*{[sky]->[grey]})
  {[weather]->[nice]}
  [black]
  {[weather]->[bad]}
  [bad]
  {[sky]->[grey]}
  [grey]
  ({[sky]->[black]}*{[time]->[night]})
command> ['test'] @ {[sky]->['current']}*{[time]->[day]}*{[weather]->[nice]}
  x2 [blue]
  [black]
  [grey]
command> ['result'] = ^['current']
  [blue]
command> ['result'] + ![blue]
reference_concept returned 0
command> ['result'] ~ [success]
  [success]