
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
  ---


