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It gets worse, however
c_3 = a_1 + b_2 z_5 = c_3 + d_9 x_4 = z_5 + e_10 DEBUG(x, x_4) y_7 = x_4 + f_11 z_8 = y_7 + g_12 ->
c_3 = a_1 + b_2 z_5 = c_3 + g_12 x_4 = z_5 + e_10 DEBUG(x, x_4) y_7 = x_4 + f_11 z_8 = y_7 + d_9
x_4 now no longer represents the value of x, but we haven't directly changed x_4, it's immediate users, or the statements that immediately make up it's defining values.
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