1. for == while hiddenΒΆ
- Equivalent codes: FOR during the day becomes WHILE at night. 
Activity: CodeLens 1.1 (cl_l20_1a_en)
Activity: CodeLens 1.2 (cl_l20_1b_en)
- Equivalent codes: 
Activity: CodeLens 1.3 (cl_l20_1c_en)
Activity: CodeLens 1.4 (cl_l20_1d_en)
- Equivalent codes: 
Activity: CodeLens 1.5 (cl_l20_1e_en)
Activity: CodeLens 1.6 (cl_l20_1f_en)
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