randomize order of trials with a stimulus trial and a response trial.

[rbruno1]

How would i randomize this experiment where there is a stim trial then a response trial. I created separate variable, "POD_trial_1" so that these would stay together as a pair - but i am having trouble randomizing the timeline

const POD_1 = {
  type: 'audio-keyboard-response',
  stimulus: 'BucketThere_POD.wav',
  response_allowed_while_playing: false,
  trial_ends_after_audio: true,
  post_trial_gap: 1000
}

const POD_1_response = {
  type: 'html-button-response',
  stimulus: ['Tell your experimenter what word she was about to say!'],
  choices: ['Continue'],
  post_trial_gap: 500
}

const POD_trial_1 = {
  timeline: [POD_1, POD_1_response]
}
.
.
.

var POD_procedure = {
  timeline: [POD_trial_1, POD_trial_2,POD_trial_3,POD_trial_4,POD_trial_5,POD_trial_6,POD_trial_7,POD_trial_8,POD_trial_9,POD_trial_10],
  repetitions: 1,
  randomize_order: true
}

I am trying to get the timeline to randomize but i haven't been able to. Any tips?