a) $(0 \cdot (0+1)^{*}) + ((0+1)^{*} \cdot 1)$ b) $(0+1)^{*} \cdot 0 0 0 \cdot (0+1)^{*}$ c) $0^* (10^+)^+$ d) $((01^+)+(1^+0))^+$ d Jonas) $(1^*(01 + 10 + 010)^+1^*)^+$
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