The cells
The cycle is an Y-Cycle because only cells with two potential values are involved. Bidirectional Y-Cycles are also known as Forcing Loops or Bivalue cycles.
The two configurations of the bidirectional cycle are enforced by two complementary, circular chains of implications. The details of each chain are given below.
Cycle details, forward direction (View 1):
{3}
Cycle details, reverse direction (View 2):
{4}