def solution(agent, start_from=1):
    # General plan: I need to get a list of receptacles to find the lettuce, take the lettuce to the microwave, heat it and put it in a diningtable.
    if start_from <= 1:
        print("[Step 1] get a list of receptacles where the lettuce is likely to appear.")
        # I can ask the assistant to do that.
        answer = ask(f'Given a list of receptacles, please sort them in descending order based on the likelihood of finding a lettuce in each of them. The list of receptacles is: {agent.receptacles}. You should directly return a Python list.")
        recep_to_check = literal_eval(answer)
        # expectation: the returned recep_to_check should not be empty.
        assert recep_to_check, f'Error in [Step 1]: recep_to_check should not be empty. {agent.report()}'
    if start_from <= 2:
        print("[Step 2] go to each receptacle in the list until seeing a lettuce")
        for receptacle in recep_to_check:
            observation = agent.goto(receptacle)
            # check if the receptacle is closed. If so, open it.
            if 'closed' in observation:
                observation = agent.open_receptacle(receptacle)
            # check if a lettuce is in/on the receptacle.
            if 'lettuce' in observation:
                break
            # expectation: I should be able to find a receptacle where a lettuce is in/on it.
            assert 'lettuce' in observation, f'Error in [Step 2]: There is no lettuce in/on {recep_to_check}. {agent.report()}'
    if start_from <= 3:
        print("[Step 3] identify the lettuce I juts found and take it")
        # I need to get the identifier of the lettuce. I can ask the assistant to do that.
        answer = ask(f'From the observation, get the identifier of an object. For example, On the cabinet 1, you see a cloth 2, and a toiletpaper 2. The identifier of cloth is 2. Now, {observation} The identifier of the lettuce? Only Output a single number without any other words.')
        found_lettuce = f'lettuce {answer}'
        observation = agent.take(found_lettuce, receptacle)
        # expectation: I should be able to take the lettuce from the receptacle.
        assert agent.holding == found_lettuce, f'Error in [Step 3]: I cannot take {found_lettuce} from the {receptacle}. {agent.report()}'
    if start_from <= 4:
        print("[Step 4] go to a microwave to heat the lettuce")
        # I should go to a microwave to heat the lettuce.
        observation = agent.goto('microwave 1')
        # check if the microwave is closed. If so, open it.
        if 'closed' in observation:
            observation = agent.open_receptacle('microwave 1')
            observation = agent.heat(found_lettuce, 'microwave 1')
        # expectation: I should be able to heat the lettuce.
        assert f'You heat the {found_lettuce} using the microwave 1.' in observation, f'Error in [Step 4]: I cannot heat the {found_lettuce}
        using the microwave 1. {agent.report()} I should have been at microwave 1 and holding {found_lettuce}.
    if start_from <= 5:
        print("[Step 5] go to a diningtable and put the lettuce on it")
        # There are multiple diningtables, and I only need to go to one of them.
        observation = agent.goto('diningtable 1')