step:
CIRCUIT[in, out] = {
X: node;
?: capacitor[X, Gnd] = 0.001pF;
U1: PETran[in, Vdd, X, Vdd | l ← 2, w ← 4, as ← 60, ad ← 60, ps ← 34, pd ← 34];
D1: NETran[in, Gnd, X, Gnd | l ← 4, w ← 2, as ← 30, ad ← 30, ps ← 32, pd ← 32];
U2: PETran[X, Vdd, out, Vdd | l ← 2, w ← 4, as ← 60, ad ← 60, ps ← 34, pd ← 34];
D2: NETran[X, Gnd, out, Gnd | l ← 4, w ← 2, as ← 30, ad ← 30, ps ← 32, pd ← 32];
};