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4.1 The real roots of nonlinear equations of the pairs of sub-law ddhrt.c 4.2 real roots of nonlinear equations of a Newton' s Law of dnewt.c 4.3 real roots of nonlinear equations of an iterative method of Aitken datkn.c 4.4 real roots of nonlinear equations of a solution of continued fraction dpqrt.c