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$a$, $b$, $c$, $d$, $e$, and $f$ are formed from three intersecting lines and represent the angle measures in degrees of their respective angles.

Which of the following statements is NOT always true?

A

$a+b+c=180$

B

$a+c+e=180$

C

$e+f=b+c+d-a$

D

$d+f=a+e+b-c$

E

All of the statements are always true.

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