Test Cases varchange

Jan Burse, created Aug 19. 2019

1 Predikate subst_neg/2

2 Predikate subst_add/3

3 Predikate subst_sub/3

4 Predikate subst_mul/3

5 Predikate subst_slash/3

6 Predikate subst_int_pow/3

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