code: def build_strings(self):
          
          for idx, dev in enumerate(self.devices):
              header = 'system.' + dev
              self.gcalls[idx] = header + '.gcall(system.dae)\n'
              self.fcalls[idx] = header + '.fcall(system.dae)\n'
              self.gycalls[idx] = header + '.gycall(system.dae)\n'
              self.fxcalls[idx] = header + '.fxcall(system.dae)\n'
              self.jac0s[idx] = header + '.jac0(system.dae)\n'
docs: build call string for each device