A Business to Business
B Business to Boss
C Boss to Business
D Boss to Boss
A Consumer to Business
B Consumer to Boss
C Commerce to Business
D Commerce to Boss
A C to C
B B to C
C C to B
D B to B
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不怕辛苦的,苦一陣子;怕辛苦的,苦一輩子
face the music. (面對現實)