(Program
{ (Binary
    (Identifier)
    (Other "<=>")
    (Identifier))
->(Binary
    (Identifier)
    (Other "==")
    (Identifier)) }
{ (Binary
    (Identifier)
    (Other "=~")
    (Identifier))
->(Binary
    (Identifier)
    (Other "!=")
    (Identifier)) }
{+(Binary
    (Identifier)
    (Other "===")
    (Identifier))+}
{-(Assignment
    (Identifier)
    (Unary
      (Other "!")
      (Identifier)))-})