code: def labeller(n, symbol="q"):
      """Autogenerate labels for wires of quantum circuits.
  
      Parameters
      ==========
  
      n : int
          number of qubits in the circuit.
      symbol : string
          A character string to precede all gate labels. E.g. 'q_0', 'q_1', etc.
  
      >>> from sympy.physics.quantum.circuitplot import labeller
      >>> labeller(2)
      ['q_1', 'q_0']
      >>> labeller(3,'j')
      ['j_2', 'j_1', 'j_0']
      """
      return ["%s_%d" % (symbol, n - i - 1) for i in range(n)]
  
imports: from __future__ import annotations
  from sympy.core.mul import Mul
  from sympy.external import import_module
  from sympy.physics.quantum.gate import Gate, OneQubitGate, CGate, CGateS
label_desc: Use image node_id 3 for calling a global function with example usage: labeller(n, symbol) and returns: unknown