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matrix elements and loading the pushdown stack

Referring to Equation 1 to identify the matrix elements,

i, j, k, l - push elements z11, z12, z21, z22
I, J, K, L - push elements m11, m12, m21, m22
B, b - check sign, confinement of Trace(Z)
T, t - push half the trace of period matrix; of instantaneous Z
P, p - pop stack, repeat top element
c - clip the number atop the stack
F - detect the classically forbidden region
Q - quit for large coordinates
v - push the independent variable
n - push the numerical datum