Substitution (resub)

a

b

c

d

e

w

x

y

z

p = ke

v = a’d + bd + c’d + ae’

s = r + b’

t = kq + e

u = q’c + qc’ + qc

q = a + b

r = p + a’

k = c + d

• Reuse existing nodes to make others simpler (closely linked to extraction and decomposition)

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