A Table-Based Selection of a Rule
S
A
a
x
A
X1
X2
Xn
…
Rule r1:
A
Y1
Y2
Ym
…
Rule r2:
Table:
...
a
...
...
...
A
t(p, a)
a(A, a)
a
  Use rule r1: A ® X1X2…Xn
Use rule r2: A ® Y1Y2…Ym
?
Which rule to use?
a
 x1
a
 x2
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