- $$\frac{{2{\text{W}}{{\text{C}}_{\text{E}}}}}{{{{\text{C}}_{\text{S}}}}}$$
- $$\frac{{{\text{W}}{{\text{C}}_{\text{E}}}}}{{{\text{2}}{{\text{C}}_{\text{S}}}}}$$
- $$\frac{{{\text{W}}{{\text{C}}_{\text{E}}}}}{{{{\text{C}}_{\text{S}}}}}$$
- $$\frac{{{\text{W}}{{\text{C}}_{\text{E}}}}}{{{\text{2}}{{\text{C}}_{\text{S}}}}}$$
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