nA - EBar collisions

Figure 3.11: There are six different alignments for an A glider approaching an EBar; they also serve as points of reference for A complexes and D's.

Table 3.8: A's can almost pass EBar's, except that in the two highest alignments they turn them into E2's and stop. An A tetrad (four equally spaced vs tetramer [block of four]) uniformly yields C2's.

align	monomer	dimer	trimer	tetramer	tetrad	pentad
top	E2	E1	D1	C2	C2	C1
hhi	E2	EBar,2 B, Atet	D1	EBar, Atet	C2	C1
hi	EBar, A	EBar,2 A	C3	C2	C2	C1
mid	EBar, A	D2	D1	C2	C2	C1
lo	EBar, A	E1	F, BBar, 2 B	F, BBar, B	C2	C1
llo	EBar, A	E1	D1	EBar,Atet	C2	C1 .

Figure 3.12: A tetrad of A gliders striking an EBar produces C2's from whatever aspect. Since the spine of the column of C2's is already formed, the subsequent arrival of another A, say as a member of a pentad, will simply promote the C2 to a C1.