S -> wZx | WyX | Z | yX | Wy | y
W -> wW | w
X -> xX | x
Z -> zZ | z
Making it
S -> wZx | WyX | zZ | z| yX | Wy | y
W -> wW | w
X -> xX | x
is just wrong. So i'm wondering if this unit production should just stay as it is
S -> wZx | WyX | Z | yX | Wy | y
W -> wW | w
X -> xX | x
Z -> zZ | z
Making it
S -> wZx | WyX | zZ | z| yX | Wy | y
W -> wW | w
X -> xX | x
is just wrong. So i'm wondering if this unit production should just stay as it is
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