['A'] + ['A'] -> ['A']:
  Raw join on index:
    0.744 (0.744), then 0.071 (0.061)
  Join after reset_index:
    1.874 (1.813), then 1.851 (1.783)
  Join via concat:
    0.062 (0.061), then 0.071 (0.060)

['A', 'B'] + ['A', 'B'] -> ['A', 'B']:
  Raw join on index:
    9.986 (9.986), then 0.314 (0.304)
  Join after reset_index:
    3.689 (2.660), then 3.703 (2.660)
  Join via concat:
    0.306 (0.305), then 0.314 (0.303)

['A', 'B', 'C'] + ['A', 'B', 'C'] -> ['A', 'B', 'C']:
  Raw join on index:
    11.986 (11.986), then 0.431 (0.421)
  Join after reset_index:
    4.231 (2.976), then 4.203 (2.943)
  Join via concat:
    0.416 (0.415), then 0.429 (0.418)

['A', 'B', 'C', 'D', 'E'] + ['A', 'B', 'C', 'D', 'E'] -> ['A', 'B', 'C', 'D', 'E']:
  Raw join on index:
    13.795 (13.795), then 0.668 (0.659)
  Join after reset_index:
    5.036 (3.406), then 5.026 (3.340)
  Join via concat:
    0.662 (0.661), then 0.667 (0.657)

['A', 'B', 'C', 'D', 'E', 'F', 'G'] + ['A', 'B', 'C', 'D', 'E', 'F', 'G'] -> ['A', 'B', 'C', 'D', 'E', 'F', 'G']:
  Raw join on index:
    16.281 (16.281), then 0.916 (0.906)
  Join after reset_index:
    5.978 (3.869), then 6.014 (3.872)
  Join via concat:
    0.904 (0.903), then 0.915 (0.904)

['A'] + ['A', 'B'] -> ['A', 'B']:
  Raw join on index:
    0.138 (0.138), then 0.146 (0.137)
  Join after reset_index:
    1.714 (0.635), then 1.715 (0.635)
  Join via concat:
    ERROR

['B'] + ['A', 'B'] -> ['B', 'A']:
  Raw join on index:
    0.142 (0.142), then 0.149 (0.139)
  Join after reset_index:
    1.786 (0.713), then 1.807 (0.714)
  Join via concat:
    ERROR

['A'] + ['A', 'B', 'C'] -> ['A', 'B', 'C']:
  Raw join on index:
    0.139 (0.139), then 0.149 (0.139)
  Join after reset_index:
    1.977 (0.692), then 2.028 (0.727)
  Join via concat:
    ERROR

['B'] + ['A', 'B', 'C'] -> ['B', 'A', 'C']:
  Raw join on index:
    0.138 (0.138), then 0.150 (0.140)
  Join after reset_index:
    1.975 (0.691), then 2.000 (0.693)
  Join via concat:
    ERROR

['A', 'B'] + ['A'] -> ['A', 'B']:
  Raw join on index:
    0.140 (0.140), then 0.150 (0.140)
  Join after reset_index:
    1.784 (0.719), then 1.768 (0.719)
  Join via concat:
    1.296 (0.221), then 1.307 (0.221)

['A', 'B'] + ['B'] -> ['A', 'B']:
  Raw join on index:
    0.228 (0.228), then 0.155 (0.144)
  Join after reset_index:
    2.311 (1.271), then 2.315 (1.264)
  Join via concat:
    1.705 (0.458), then 1.731 (0.413)

['A', 'B', 'C'] + ['A'] -> ['A', 'B', 'C']:
  Raw join on index:
    0.138 (0.138), then 0.149 (0.139)
  Join after reset_index:
    1.990 (0.744), then 2.012 (0.745)
  Join via concat:
    1.674 (0.243), then 1.691 (0.244)

['A', 'B', 'C'] + ['B'] -> ['A', 'B', 'C']:
  Raw join on index:
    0.140 (0.140), then 0.150 (0.139)
  Join after reset_index:
    2.011 (0.740), then 2.005 (0.739)
  Join via concat:
    1.844 (0.243), then 1.867 (0.244)

['A', 'B', 'C'] + ['A', 'B'] -> ['A', 'B', 'C']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    9.468 (8.161), then 8.302 (6.991)
  Join after reset_index:
    2.262 (1.022), then 2.281 (1.026)
  Join via concat:
    5.982 (4.496), then 5.010 (3.513)

['A', 'B', 'C', 'D', 'E', 'F'] + ['A', 'B', 'C', 'D', 'E'] -> ['A', 'B', 'C', 'D', 'E', 'F']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    11.993 (9.974), then 12.791 (10.751)
  Join after reset_index:
    3.456 (1.588), then 3.467 (1.585)
  Join via concat:
    8.669 (6.391), then 7.632 (5.354)

['A', 'B'] + ['A', 'B', 'C'] -> ['A', 'B', 'C']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    7.053 (5.733), then 7.282 (5.968)
  Join after reset_index:
    2.135 (0.945), then 2.155 (0.940)
  Join via concat:
    ERROR

['A', 'B', 'C', 'D', 'E'] + ['A', 'B', 'C', 'D', 'E', 'F'] -> ['A', 'B', 'C', 'D', 'E', 'F']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    11.252 (9.233), then 11.802 (9.768)
  Join after reset_index:
    3.272 (1.537), then 3.287 (1.538)
  Join via concat:
    ERROR

['A', 'B', 'C'] + ['A', 'B', 'D'] -> ['A', 'B', 'C', 'D']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    3.843 (1.930), then 4.690 (2.770)
  Join after reset_index:
    1.581 (0.591), then 1.592 (0.590)
  Join via concat:
    ERROR

['A', 'B', 'C'] + ['B', 'C'] -> ['A', 'B', 'C']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    12.946 (11.640), then 12.769 (11.485)
  Join after reset_index:
    3.185 (1.929), then 3.189 (1.929)
  Join via concat:
    9.545 (7.789), then 8.223 (6.457)

['B', 'C'] + ['A', 'B', 'C'] -> ['B', 'C', 'A']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    7.999 (6.669), then 8.847 (7.523)
  Join after reset_index:
    2.354 (1.139), then 2.371 (1.143)
  Join via concat:
    ERROR

['A', 'B', 'C'] + ['A', 'C'] -> ['A', 'B', 'C']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    12.678 (11.408), then 12.728 (11.444)
  Join after reset_index:
    3.142 (1.889), then 3.192 (1.899)
  Join via concat:
    8.943 (7.179), then 7.831 (6.067)

['A', 'C'] + ['A', 'B', 'C'] -> ['A', 'C', 'B']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    7.893 (6.570), then 8.198 (6.868)
  Join after reset_index:
    2.224 (1.004), then 2.218 (1.005)
  Join via concat:
    ERROR

['A', 'B'] + ['B', 'A'] -> ['A', 'B']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    13.523 (13.494), then 8.836 (8.795)
  Join after reset_index:
    3.818 (2.774), then 3.834 (2.771)
  Join via concat:
    12.377 (12.347), then 8.647 (8.605)

['A', 'B', 'C', 'E', 'F'] + ['A', 'C', 'D', 'B', 'F'] -> ['A', 'B', 'C', 'E', 'F', 'D']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    6.847 (3.713), then 6.673 (3.518)
  Join after reset_index:
    2.083 (0.741), then 2.089 (0.740)
  Join via concat:
    ERROR