Example:
{T} ? { (x>=0) ? (x <= 0)}
if x >= 0
{x = abs(x)}
z:=x;
{z = abs(x)}
[] x >= 0
{- x = abs(x)}
z:= - x;
{z = abs(x)}
fi
{ (x >=0 ? x <= 0) ? (x >=0 ? z = abs(x)) ? (x <=0 ? z = abs(x)) }
? {z = abs(x)}
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