$L = \{x \in(a+b+c+d)^* \mid -10 \leq ( |x|_a + |x|_b) - ( |x|_c + |x|_d) \leq 10 \}$
I don't have any idea. Can someone help me.
How construct PDA to $L = \{x \in(a+b+c+d)^* \mid -10 \leq ( |x|_a + |x|_b) - ( |x|_c + |x|_d) \leq 10 \}$
PoliteMan
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