---
default_set: 'centos-64-x64'
sets:
  'centos-59-x64':
    nodes:
      "main.foo.vm":
        prefab: 'centos-59-x64'
  'centos-64-x64':
    nodes:
      "main.foo.vm":
        prefab: 'centos-64-x64'
  'fedora-18-x64':
    nodes:
      "main.foo.vm":
        prefab: 'fedora-18-x64'
  'debian-607-x64':
    nodes:
      "main.foo.vm":
        prefab: 'debian-607-x64'
  'debian-70rc1-x64':
    nodes:
      "main.foo.vm":
        prefab: 'debian-70rc1-x64'
  'ubuntu-server-10044-x64':
    nodes:
      "main.foo.vm":
        prefab: 'ubuntu-server-10044-x64'
  'ubuntu-server-12042-x64':
    nodes:
      "main.foo.vm":
        prefab: 'ubuntu-server-12042-x64'

---
default_set: 'centos-64-x64'
sets:
  'centos-59-x64':
    nodes:
      'main.foo.vm':
        prefab: 'centos-59-x64'
  'centos-64-x64':
    nodes:
      'main.foo.vm':
        prefab: 'centos-64-x64'
  'fedora-18-x64':
    nodes:
      'main.foo.vm':
        prefab: 'fedora-18-x64'
  'debian-607-x64':
    nodes:
      'main.foo.vm':
        prefab: 'debian-607-x64'
  'debian-70rc1-x64':
    nodes:
      'main.foo.vm':
        prefab: 'debian-70rc1-x64'
  'ubuntu-server-10044-x64':
    nodes:
      'main.foo.vm':
        prefab: 'ubuntu-server-10044-x64'
  'ubuntu-server-12042-x64':
    nodes:
      'main.foo.vm':
        prefab: 'ubuntu-server-12042-x64'

Change double quotes to single quotes.
Change double quotes to single quotes.
