Refer to the figure given below. AB, CD and EF are three parallel paths. A person starts from AB to reach EF by moving in four steps - moving from AB to $$O_1$$ in step 1, from $$O_1$$ to CD in step 2, from CD to $$O_2$$ in step 3 and from $$O_2$$ to EF in step 4. If he takes a curved path in one step, he cannot take a curved path in the next step. In how many ways the person can reach EF from AB ?
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