p37
Stage 4 turtles idea is part of the third phase transformed from a part of the fourth stage,
But it can not be over the first two stages, so that a position of the second stage is 0 --- 4 line conversion means prior to the matrix elements are 0 2
p1 = 0 means the preservation of turtle eggs is not more than one year to be used as soon as possible, so there is no surviving a year ago turtle eggs