The Watchtower new math.
It used to be that 2+2=4.
Thats the old math.
Similar math was the Watchtower date setting seen below.
A + B + C = Z.
Where
A is -607 and the false and invented date for Babylon.
B is 2520 , the gymnastics of math from the Watchtower bible
C is the adjustment for the absence of a zero year from BC to AD
Z is 1914, Jesus second coming.
-607 + 2520 + 1 = 1914
The new math below.
-607 + 2520 + 1 =approximately 1914, but really 1919
That’s like 2n+ 2 > 4 and usually 7