何时需要执行多个任务

Question

我在看一些有趣的例子，发现了following example：

tasks:
    - shell: echo "I've got '{{ foo }}' and am not afraid to use it!"
      when: foo is defined

    - fail: msg="Bailing out. this play requires 'bar'"
      when: bar is undefined

让我们说，如果“ somevar已定义”，我们只想运行以下任何任务

tasks:
    - shell: echo "1"
      when: foo is defined

    - shell: echo "2"
      when: barone is defined

    - shell: echo "3"
      when: bartwo is defined

    - shell: echo "4"
      when: bar is undefined

是否可以一次将“何时”添加多个任务？ 我想避免以下情况

tasks:
    - shell: echo "1"
      when: 
        -foo is defined
        -somevar is defined

    - shell: echo "2"
      when: 
        -barone is defined
        -somevar is defined

注意多次（假设有100个任务）。