['A'] + ['A'] -> ['A']:
  Raw join on index:
    0.747 (0.747), then 0.072 (0.062)
  Join after reset_index:
    1.799 (1.738), then 1.804 (1.735)
  Join via concat:
    0.062 (0.061), then 0.070 (0.060)

['A', 'B'] + ['A', 'B'] -> ['A', 'B']:
  Raw join on index:
    9.880 (9.880), then 0.314 (0.304)
  Join after reset_index:
    3.712 (2.659), then 3.696 (2.662)
  Join via concat:
    0.304 (0.303), then 0.312 (0.302)

['A', 'B', 'C'] + ['A', 'B', 'C'] -> ['A', 'B', 'C']:
  Raw join on index:
    11.765 (11.765), then 0.429 (0.420)
  Join after reset_index:
    4.158 (2.920), then 4.197 (2.945)
  Join via concat:
    0.416 (0.416), then 0.430 (0.419)

['A', 'B', 'C', 'D', 'E'] + ['A', 'B', 'C', 'D', 'E'] -> ['A', 'B', 'C', 'D', 'E']:
  Raw join on index:
    13.825 (13.825), then 0.675 (0.665)
  Join after reset_index:
    4.964 (3.327), then 4.957 (3.323)
  Join via concat:
    0.660 (0.659), then 0.673 (0.663)

['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:
    16.335 (16.335), then 0.914 (0.904)
  Join after reset_index:
    6.047 (3.931), then 5.969 (3.842)
  Join via concat:
    1.032 (1.031), then 0.932 (0.921)

['A'] + ['A', 'B'] -> ['A', 'B']:
  Raw join on index:
    0.146 (0.146), then 0.153 (0.143)
  Join after reset_index:
    1.813 (0.660), then 1.830 (0.647)
  Join via concat:
    ERROR

['B'] + ['A', 'B'] -> ['B', 'A']:
  Raw join on index:
    0.142 (0.142), then 0.148 (0.138)
  Join after reset_index:
    3.034 (0.644), then 3.033 (0.645)
  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:
    2.245 (0.675), then 2.293 (0.674)
  Join via concat:
    ERROR

['B'] + ['A', 'B', 'C'] -> ['B', 'A', 'C']:
  Raw join on index:
    0.139 (0.139), then 0.150 (0.140)
  Join after reset_index:
    2.623 (0.677), then 2.625 (0.673)
  Join via concat:
    ERROR

['A', 'B'] + ['A'] -> ['A', 'B']:
  Raw join on index:
    0.141 (0.141), then 0.150 (0.140)
  Join after reset_index:
    1.811 (0.770), then 1.770 (0.721)
  Join via concat:
    1.369 (0.222), then 1.378 (0.221)

['A', 'B'] + ['B'] -> ['A', 'B']:
  Raw join on index:
    0.228 (0.228), then 0.157 (0.146)
  Join after reset_index:
    2.316 (1.275), then 2.328 (1.269)
  Join via concat:
    2.074 (0.331), then 2.137 (0.381)

['A', 'B', 'C'] + ['A'] -> ['A', 'B', 'C']:
  Raw join on index:
    0.139 (0.139), then 0.151 (0.141)
  Join after reset_index:
    2.007 (0.749), then 2.025 (0.750)
  Join via concat:
    1.783 (0.245), then 1.828 (0.252)

['A', 'B', 'C'] + ['B'] -> ['A', 'B', 'C']:
  Raw join on index:
    0.142 (0.142), then 0.151 (0.141)
  Join after reset_index:
    2.043 (0.748), then 2.026 (0.744)
  Join via concat:
    2.375 (0.247), then 2.382 (0.250)

['A', 'B', 'C'] + ['A', 'B'] -> ['A', 'B', 'C']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    10.630 (8.266), then 9.447 (7.073)
  Join after reset_index:
    2.310 (1.035), then 2.299 (1.034)
  Join via concat:
    7.029 (4.518), then 6.084 (3.551)

['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):
    14.346 (10.155), then 15.117 (10.882)
  Join after reset_index:
    3.494 (1.601), then 3.504 (1.602)
  Join via concat:
    10.891 (6.433), then 9.852 (5.391)

['A', 'B'] + ['A', 'B', 'C'] -> ['A', 'B', 'C']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    8.051 (5.712), then 8.355 (6.012)
  Join after reset_index:
    3.172 (0.952), then 3.200 (0.950)
  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):
    13.596 (9.378), then 14.123 (9.892)
  Join after reset_index:
    5.491 (1.557), then 5.498 (1.550)
  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):
    3.973 (1.943), then 4.802 (2.765)
  Join after reset_index:
    1.697 (0.595), then 1.709 (0.597)
  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):
    16.308 (8.877), then 16.103 (8.313)
  Join after reset_index:
    3.207 (1.942), then 3.220 (1.940)
  Join via concat:
    13.297 (5.129), then 12.223 (4.524)

['B', 'C'] + ['A', 'B', 'C'] -> ['B', 'C', 'A']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    11.909 (5.469), then 12.674 (5.760)
  Join after reset_index:
    7.899 (0.952), then 7.553 (0.954)
  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):
    15.570 (8.461), then 16.056 (8.191)
  Join after reset_index:
    3.197 (1.921), then 3.203 (1.910)
  Join via concat:
    13.816 (5.691), then 12.073 (4.349)

['A', 'C'] + ['A', 'B', 'C'] -> ['A', 'C', 'B']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    12.192 (5.767), then 12.683 (5.798)
  Join after reset_index:
    7.599 (0.956), then 7.164 (0.957)
  Join via concat:
    ERROR

['A', 'B'] + ['B', 'A'] -> ['A', 'B']:
  Raw join on index:
    ERROR
  Join on index with workaround (partial reset_index):
    18.063 (9.557), then 13.828 (4.695)
  Join after reset_index:
    3.830 (2.784), then 3.842 (2.785)
  Join via concat:
    9.612 (0.312), then 8.897 (0.314)

['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):
    7.884 (3.318), then 8.178 (3.291)
  Join after reset_index:
    2.933 (0.737), then 2.888 (0.735)
  Join via concat:
    ERROR