/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

a:
  a = 1
  b = 2
  c = 3
  X = 4
  ---
  1
  2
  3
  4
  ---

B:
  d = 10
  e = 20
  f = 30
  X = 40
  ---
  10
  20
  30
  40
  ---

a + B:
  a = 1
  b = 2
  c = 3
  X = 40
  d = 10
  e = 20
  f = 30
  ---
  1
  2
  3
  40
  10
  20
  30
  ---

B + a:
  d = 10
  e = 20
  f = 30
  X = 4
  a = 1
  b = 2
  c = 3
  ---
  10
  20
  30
  4
  1
  2
  3
  ---

a + a:
  a = 1
  b = 2
  c = 3
  X = 4
  ---
  1
  2
  3
  4
  ---

{} + a:
  a = 1
  b = 2
  c = 3
  X = 4
  ---
  1
  2
  3
  4
  ---

a + {}:
  a = 1
  b = 2
  c = 3
  X = 4
  ---
  1
  2
  3
  4
  ---

{} + {}:
  ---
  ---

a + b + {} + b + {} + a:
  a = 1
  b = 2
  c = 3
  X = 4
  d = 10
  e = 20
  f = 30
  ---
  1
  2
  3
  4
  10
  20
  30
  ---