#parenthesis-free_notation  a notation for forming mathematical expressions that does not use parentheses to delimit components
  supertype:  #mathematical_notation  a notation used by mathematicians
  subtype:  #prefix_notation__Lukasiewicz_notation__Polish_notation  a parenthesis-free notation for forming mathematical expressions in which each operator precedes its operands
  subtype:  #postfix_notation__postfixnotation__suffix_notation__reverse_Polish_notation  a parenthesis-free notation for forming mathematical expressions in which each operator follows its operands

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