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I hope I have this right.

0:00~0:08 (C1-C5) - immr
0:08~0:11 (C6-C7) - Sunada LO
0:11~0:21 (C8-C11) - AbeGen
0:21~0:23 (C12) - ??
0:23~0:26 (C13a-C13b) - Genki LO
0:26~0:30 (C14-C17) - Genki
0:31~0:43 (C18-C23) - ??