- $$\frac{{{{\text{K}}_{\text{f}}} + 1}}{{{{\text{K}}_{\text{t}}} + 1}}$$
- $$\frac{{{{\text{K}}_{\text{f}}} - 1}}{{{{\text{K}}_{\text{t}}} - 1}}$$
- $$\frac{{{{\text{K}}_{\text{t}}} + 1}}{{{{\text{K}}_{\text{f}}} + 1}}$$
- $$\frac{{{{\text{K}}_{\text{t}}} - 1}}{{{{\text{K}}_{\text{f}}} - 1}}$$
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