- $${\varepsilon _{\text{c}}} + 2{\varepsilon _{\text{l}}}$$
- $$2{\varepsilon _{\text{c}}} + {\varepsilon _{\text{l}}}$$
- $${\varepsilon _{\text{c}}} + \varepsilon _{\text{l}}^2$$
- $$\varepsilon _{\text{c}}^2 + {\varepsilon _{\text{l}}}$$
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