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Chapter 2
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.. toctree::
   :maxdepth: 1

   ex_2.1_cal_limits
   ex_2.2_getline_without_and_or
   ex_2.3_htoi
   ex_2.4_squeezess
   ex_2.5_any
   ex_2.6_setbits
   ex_2.7_invert
   ex_2.8_rightrot
   ex_2.9_bitcount2s
   ex_2.10_lowercondit