| colorscheme_default | Preset blue and cyan color scheme (default) |
| colorscheme_orange_black | Preset yellow and black color scheme. |
| colorscheme_purple_ivory | Preset yellow and black color scheme. |
| pioDisp | Display some content. |
| pioHdr | Print a header |
| pioStr | Print a string 'A = ...'. |
| pioTit | Print a title. |
| pioTkn | Tokenizer. |
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