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