command> ['test'] +  [A]
  [A]
command> ['test'] + ![A]
reference_concept returned 0
command> ['test'] +  [A]*[B]
  [A]
  [B]
command> ['test'] + ![A]*![B]
reference_concept returned 0
command> ['test'] +   [A]*[B]
  [A]
  [B]
command> ['test'] + !([A]*[B])
reference_concept returned 0
command> ['test'] + !{[A]->[B]}
  !{[A]->[B]}
command> ['test'] +  {[A]->[B]}
reference_concept returned 0
command> ['test'] +  {[A]->[B]}
  {[A]->[B]}
command> ['test'] + !{[A]->[B]}
reference_concept returned 0
command> ['test'] + !{[A]->[B]} *  {[C]->[D]}
  !{[A]->[B]}
  {[C]->[D]}
command> ['test'] +  {[A]->[B]} * !{[C]->[D]}
reference_concept returned 0
command> ['test'] +  {[A]->[B]} *  {[C]->[D]}
  {[A]->[B]}
  {[C]->[D]}
command> ['test'] + !{[A]->[B]}
  {[C]->[D]}
command> ['test'] + !{[C]->[D]}
reference_concept returned 0
command> ['test'] +  <50%[A], 50%[B]>
  50% [A]
  50% [B]
command> ['test'] + !<50%[A], 50%[B]>
reference_concept returned 0
command> ['test'] + (['test'] + [A])*[B]
  x2 [A]
  [B]
command> ['test'] + ![B]
  x2 [A]
command> ['test'] + ![A]*![A]
reference_concept returned 0
command> ['test'] ~ [success]
  [success]