Line-up permutation

Obtain line-up permutation, P, and position of corresponding block in the Hamiltonian. 

Because of slow kinetics, space velocities must allow residence times of 20 to 120 min and are therefore around two to dtree volumes per volume per hour, in two or three in-line columns, two to three meters high. This set up allows bed permutation and maximum saturation in the first column (bed specific gravity of 0.42 to 0.46). 

Before starting to solve this part by random trial and error, consider a more systematic approach. We start with the simplest case of all chlorines positioned cis to one another (using all wedged lines) and then look at the various permutations obtained by placing a progressively increasing number of the substituents trans (hashed lines). We can stop at the stage of three chlorines up and three chlorines down because two up and four down is the same as four up and two down, and so on. The first two cases, six up (A) and five up and one down (B), are unique because only one structural possibility exists for each ... 

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