Answer:
The answer is "c || f and d || e".
Explanation:
Its acute collision angle between e and t is:

Its angle refers to the acute corner of d, so d and e are parallel to its extreme angle of crossroads between c and t is:

Its angle is identical to the acute angle of, f so, that c and f are parallel.

All "corresponding" to extreme angles at crossings of t. Thus the associated points are connected to their congruence.