2. Black hole

3. B
L
A
C
K
H
O
L
E
Let A = 4, B = 5, C = 1
)()( ABxABC
2
)()( ABABC
22
2 AABBCACB
222
)2( AAABBCACB
ABBACACB 222
ABABBACACB )2( 22
ABBABACACB 22
CBABBABACACB )( 22
CBABBABACA 22
)()( CABBCABA
BA
54

4. Where is the black hole?
We can get the black hole in
the 11th line, exactly in part B-
A-C. That from the first, we
have C=B-A, if we take in these
to B-A-C, so we have C-C=0.