ResultSet
result variable: x
result variable: y
result variable: z
size: 2
solution: ResultSolution
  binding: ResultBinding
    variable: x
    value: r-2
  binding: ResultBinding
    variable: y
    value: p-1
  binding: ResultBinding
    variable: z
    value: v-2-1
solution: ResultSolution
  binding: ResultBinding
    variable: x
    value: r-2
  binding: ResultBinding
    variable: y
    value: p-2
  binding: ResultBinding
    variable: z
    value: v-2-2