first introduce the series rkn1.rb through rkn4.rb, the first two of which were already introduced in the previous volume, and all of which still depend on clop.rb as introduced in the previous volume.

Note that the change from Nbody to NBody is described in the text that is temporarily parked in the next chapter

Then start improving the clop.rb function.

Finally move from rkn4.rb to nbody_cst0.rb.

Note that nbody_cst0.rb still uses global variables; and so does nbody_cst1.rb in later volumes. This is finally changed when nbody_sh1.rb appears.

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