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### 2.9 Blocks

Org mode uses begin...end blocks for various purposes from including source code examples (see Literal examples) to capturing time logging information (see Clocking work time). These blocks can be folded and unfolded by pressing TAB in the begin line. You can also get all blocks folded at startup by configuring the option `org-hide-block-startup` or on a per-file basis by using

    #+STARTUP: hideblocks
    #+STARTUP: nohideblocks