When there are two command blocks next to each other, we'll call them A and B, giving power to A causes B to activate also.
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I noticed this does not seem to work with all directions.
I placed a Commandblock with a Comparator and then 3 Command blocks in a line like this (x = command block, - comparator,.. = air)
x x x
...-...
...x
INPUT HERE
The left commandblock is facing South the right one North and only the commands from the north (right) Block get executed.
I tried a Command block above and to the west but that did not work either.
Working as intended.