and to do so makes pleas in abatement or of res judicata available respectively against all actions other than the one first commenced or on which judgment is first rendered. 1 C.J.S Actions, ?? 102(b), Rule Against Splitting.See also, 1 Am.Jur.2d, Actions, ???? 127-155, Splitting Causes of Action.This court has repeatedly held that a cause of action cannot be divided; that when there is a singl