diff --git a/narration/images/context_in_functions_is_not_really_a_context.excalidraw.svg b/narration/images/context_in_functions_is_not_really_a_context.excalidraw.svg
index 6dfa025..d70b984 100644
--- a/narration/images/context_in_functions_is_not_really_a_context.excalidraw.svg
+++ b/narration/images/context_in_functions_is_not_really_a_context.excalidraw.svg
@@ -1,6 +1,6 @@
 <svg version="1.1" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1435.5130208333333 744.0703125" width="1435.5130208333333" height="744.0703125">
   <!-- svg-source:excalidraw -->
-  <!-- payload-type:application/vnd.excalidraw+json --><!-- payload-version:2 --><!-- payload-start 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dRcdTAwMDaWpSSO0KMvy6RcdTAwMTaOXHUwMDFjxSlLM2DgXHUwMDAzeEnRQZJpuypcdTAwMTOOXHUwMDEwxVx1MDAxMmDuKLO6x1wiXHUwMDAz5aTLXvP1TqAhlVY2XHUwMDFmYVbQUq7zdVxiXGLWXFxcdTAwMDJcdTAwMTiXl1x1MDAwMVx1MDAwM9gzoFx1MDAxYmVcdTAwMDBItytcdTAwMDBcdTAwMDcjobpQXHUwMDBiXHUwMDE0QVx0rN6vylx1MDAxYpIyh2pmlVx1MDAwNcFcdTAwMGXiRcunctpVtDRcdTAwMDdTXHRpdWVz0FNcdTAwMWJZmlx1MDAwM3dQoVx1MDAxOVx1MDAxOFx1MDAwMdZSxMqchZNO98pXg1kzNu5kXpqFckpMgVx0y4YgurwlmbZkXHUwMDEwataNXHUwMDE30/NcdHUvTU9cdTAwMWPGSiyBU4dbUVx1MDAwMqWOXCLZYGmUgXDQXHUwMDE4qUuzYE6ZMXLljCZcXFh8XHUwMDA1XHUwMDAwXCKr30Y5aIdZVqOAJ0s4VSCHI7t6kM5osVIuXHUwMDAz7NjWgnTApVx1MDAxNZtSzEh3aVx1MDAxNlBjRNJcdTAwMDK7XHUwMDBiaKORsLbIgfBcIjNcdGghSu2aQkFNSl0gXHUwMDA2wVx1MDAxZG5blZBFWXNCXHUwMDE2ilx1MDAxMiuCNVmoXHUwMDExXHTks9CWXlx1MDAxMrLgssSwhXAotmxS8DVFgoNcZsb52qQva1xysUo9lPJcdTAwMGJkMaliiyxMjFrWoHR8fWlcdTAwMTZcdTAwMWGiq1x1MDAxMSHm7ZJgO5fHzFx1MDAxMERcdTAwMDGbeKyDlqZcdTAwMDZ9UeayOXgrbkeUzFx1MDAxMKUu4TnmWLRcdTAwMDNcdTAwMDOBVVx1MDAwMkxD08hOMjCo7kJ6XHUwMDA2cGV25sxkqaNiYEp2qsfMxysxXHUwMDAzU7V2vlx1MDAwZT62zN1LW442LimvVmxbj3NcdTAwMDeXQYmiqVx1MDAxYVxcmlx1MDAwNVx1MDAxMHyZdlx1MDAwNVx1MDAxMWFpheCOcFx1MDAxOcODlNJ22lx1MDAxNbxcdKZFVsNcdTAwMTLku51kXHUwMDEypJRSMFQltXNcdTAwMTFcdTAwMDBajUjRXHUwMDE2jSrWVlxuvtzdg/vT2opcdTAwMTZccolcdTAwMTeBaEJcdTAwMGJcdTAwMGIrNOSZL7kziruXJpWOKlx1MDAwNnvYOvhcdTAwMTGgulx1MDAwYoFcdTAwMDdz7DhUmFx1MDAwNZOFl1x1MDAwM43bwd/M+ynKXHUwMDEz4Fx1MDAwNKuksuTVoDVsXHUwMDFhXHUwMDFiXHUwMDEyXHUwMDE3TV5NTchcIr0ukVx1MDAxM2Bs3Fx1MDAxMjNcdTAwMTKVQt9syGRcdTAwMTkmQFx1MDAwZbSE+iCI08o6h9zbIdCSlnDRpYJcbnJgtnVcYtDK01x1MDAxNiRH48DBXHUwMDAybiVNaPabs/NcXMbL06JcdTAwMTaDXHUwMDA2sFxy2blZtZRNXGaymlpVPfhnXVwiJsGALFx1MDAwNS1HJY5cdTAwMTNcdTAwMDSNXHJTQVx1MDAxY1iix0FYLk1cYmqDXHUwMDE2X6umfYTLMjDqtSQwXHUwMDA0S1CWOp6VhiNyWq6lXHUwMDE54MKkkVFcdTAwMDZcdTAwMTjbtVx1MDAxY4TWuKSfS5htXHUwMDFm7HqreOknXGLLyJbQaadUNrld6YGhcilN7GFlNuDPdUlQzifuZ2l6XHUwMDBl0U+Rsflk/GNpejqN3bPpuWU8XHUwMDBl6Mq3+6xIy1x1MDAxMuuyjiVcdTAwMTNsWFx0XHUwMDFjWZhcdTAwMWY4Sm7Zn1x1MDAwM1xcl/fQIFx1MDAxZIW0XHUwMDAyXHUwMDFkK3Smj9PbVTv4k5Lg2/Rx2dEkLemK5o4lWHCpyUF4YGXtxtiLXHUwMDA2YynJmqg03lx1MDAwN1x1MDAxN4nszFxyXHUwMDE0XFzx1badgJB4XHUwMDFjTGfTY0uirFx1MDAxYS74LZdqq+fGyeuw3/eTxGtcdTAwMWaZMYj8eEXs94c9N/GOXCIvjs241Fx1MDAxZo0kXHUwMDFhzlxyXFyMr4+GRtKrVeNto/G+acq5sejKsTZiplx1MDAxYulVZlx1MDAxOC9eklDTobammWc/mlOlhERmMvz0fjrghrhxXHUwMDEwXGJEPag7LKpXqVisLKtcdTAwMWN4g3B8JIEh+syWYTr8Zlx1MDAxNnJcdTAwMTPgTGBDpFx1MDAxNJfwl1lRxrOONUGIUfxcXFPyXHUwMDE3XHLPPXib7Dhxo2THXHUwMDBm2n5wkS3Y+PCGfYu1Ueajw9bQlFx1MDAxMuhcdTAwMDUhXHUwMDBlmlx1MDAwM+rRLD7CclbbpsbcgVx1MDAxOes0a/xAmSApjLBkqvDxXtBeXqjFe2nnXG4liITgzSyIXHUwMDAy1yh5sVBcdTAwMTA7IcLkZKpcdTAwMTJmhUJZcIqpzW3DXHUwMDA2Xc8tWFx1MDAwMHzU/L08bax1pLTS5NPURWMvUunDXHUwMDE4XHUwMDBmjLGK8rBcdTAwMDY1q1x1MDAxMV5hXHUwMDBmxMUrTerKeWzUw4RcdDVzqSmZrS1cdTAwMWXN8IYoXHRiMVwiMdBcdTAwMWVnrHqy6WM5XHUwMDBmYkZcdTAwMDLEm5ZiNlx1MDAwNSjDeUBcdTAwMWPgj5WEtsFzc4CnO1x1MDAxMSNcdTAwMDLidDOrzlx1MDAxZkd5QHpIrbLFyaqUt3i5W4HytKTgz7FcdTAwMTBcdTAwMTJcdTAwMTPJ8Jy+yZJcdTAwMWUwo1bKqMyHkd7ibYxcdTAwMTeQXHUwMDFlwVRcdTAwMTdcbvX/j/RKbT5NXbD2dXFcdTAwMWXl+YvTRciIXHUwMDEzoelcbpPrXHUwMDE3L1x1MDAxZqop44GTd0b9+mj0y8431EiOdpdcdTAwMTSYKrO780ZcYo8jXHUwMDA3XHUwMDE0haKMMYSUZLxkklx1MDAxNTY9RFx1MDAxMDVijJhcdTAwMTaIzlx1MDAxN2XCeIIqhuU6NsV5cSrPWlCZKVdcdTAwMDZJVGJccjJD4zJmXHUwMDAxscy5nJ5d9TC6W7yuMlMkRDjl1CybZVx1MDAxY9wv50VcdTAwMGU2XHUwMDEzl4hEglx1MDAwMkFcdTAwMDNNXHUwMDE3m+MlsV21wZtfs2jra9N4vHK3XFxoa8WY6Wq2ZrzFa7dqynhEmyNiXG6LyrlwONzSVNSe6FxiZlRpM6+zfkS3cW1nLaJcZtFBRStcdTAwMDUhkkRcXCit5p5aK9MtXs26gOm01EWmY1x1MDAwZVx1MDAwMX7DWoKRXHUwMDEyXGK0f1Hd3NevIO0qmVx1MDAwZZS1zFx1MDAxY3W4tP9u4Vx1MDAwMu6a8lx1MDAxY8RcdTAwMDRObjLRWNIpXHUwMDA3L1498qjgVTmZ4bh5YsvPLZpcdTAwMTBcdTAwMWHEVkqI+Vx1MDAxZdXa8NnDZ89b8tkqKkmaw1x1MDAxOaBNMdMg4mY0O1x1MDAxN6hSgzCoZ2SmO4hcdTAwMDfy2eKN/3OBKlRcdTAwMTNUXHUwMDE0M8XCJlx1MDAwZVx1MDAxNYVSXHRHXHUwMDExMdtL5YVcdTAwMTNa3sDNr4lLhkFcdTAwMWWp1FhlaFxudY1M2G9PYItcdTAwMTfD15TAXHUwMDE4M7NcdTAwMDeyuymMtZrMz4h/dlxuk1xucVwi1bNtsfCckmxcdTAwMTX581RcdTAwMTS2eFx1MDAwZvVfXHUwMDE09lx1MDAxNFx1MDAxNMYqd+aUkkAwT2ZgWUpgXHUwMDBityuoKYFcdMrzUzSeQoGlXHUwMDBigzKzeeZcdEzl5qhNj1xm5lx1MDAxMCNBwFFDXHUwMDAy27hcdTAwMDaz1jtmelwiwVx1MDAwNP6QXHUwMDEyM/jfrK9xSlx1MDAxNdisXHUwMDAxXHUwMDE5LVx1MDAwZaviXG4rXHUwMDA2W7xXS47BIEqEMjEtMVCZmVx1MDAwMVQsXHUwMDE2clx1MDAxNMOYjXdzgIp90Vx1MDAxNFY0cvNrzux7XSRm1EZcdTAwMTWNQdSCXHUwMDExVfPHnyztMlu4XHUwMDA1RE2JTDJcdTAwMDZcdTAwMGWDMzPwT1HhSGVccu6EISomtrVcdTAwMTlRxlx1MDAxZMFBXHUwMDEygFx1MDAxYlx1MDAxNlrB/4vkRonZkNE8Y8rJyFxcQcYjXHUwMDA0XGZcdEYlWcdxNS9Opa2iiChQXGLCklx0aFtcXOw2U45cdTAwMTZMUCzNwaZcdTAwMTCJ4Icx3OJtcbIlXCJmplx1MDAxMVx1MDAwMiNcdTAwMDTmXHUwMDE1XHUwMDA0XHUwMDE1daPhNymm5yS9dH6rNHfzK1x1MDAxOPrmXHUwMDE1m1FrmLJcdTAwMTWYbvFOUHVlOrPRQ06bTSRcdTAwMWJcdTAwMTdcdTAwMDRcdTAwMGIpXHUwMDAwqZua+GHWpaJq6SZcdTAwMDVEKFxcSYJcdTAwMTCa33Jk0ovGkFx1MDAxNlx1MDAxONdzktuKh9qsSm7WYsnsJEE1XHUwMDA2RVx0zptJLmlxOlx1MDAxOTY78MzOXHUwMDE4l+yBXG5u8XlcIo3csFx1MDAwMFhcdTAwMTWWlCFcdFwijpBcdTAwMTJcdTAwMDHHzOJkNSlcdTAwMTd/4TFoia2bX7Ng5mtcdTAwMTNydG72WnHsXHUwMDEzKn6Vk0JcdTAwMTdvKVRTdlNKOaTAbSZOXHUwMDAxf0I0NZs8QHtsZuyTmEU+XHUwMDA0SYBcdTAwMTOhiKO57WRnXG7O7PNcdTAwMDI3jfigipTsqFx1MDAwM3dR9myA2pDcxlx1MDAxNZy1XjL9bIxcdDTaflxiXHUwMDE4TMxNp5rQiVmnLSe7Rz+c5Fx1MDAxNu+yli1cdTAwMTQ8iqVZq0AkqFx1MDAxYVxcZF6zlSc1XHUwMDFiiYG0UfRlXHUwMDEzXFy1vZtfs2Dqa+M5UblPs9agJVx1MDAxMV2h323xUXc1pTmMhHJyi3TGKo46QHZGw4Fynlcka53kwfOLz+fn7UKbXHUwMDFic5Dm/VjwXHUwMDAyw1x1MDAxMVx1MDAwNJpcdTAwMWVv6LSomqu4VVx1MDAwNJOE5lXp0lx1MDAxNFx1MDAxME60TMVcdTAwMTGzTGx6ci5fRnDZ73hBRFO0N/NrXHUwMDE2TW1Fhqk6cYtWz6yQXHUwMDFjjIRpba+jVPM0ev/6cpt/7URd+ebu5P60/lx1MDAxYsE3sWaOzO6DeZdGj8hRueHBNVx1MDAxMlx1MDAwYkYqnYlcdTAwMGUqIzv4Odueszi1XHUwMDAymeVcIlx1MDAwMj3jQZFUcMDgrGSbP16r4TZcdTAwMDb+ID2jqlx1MDAxMXZcdTAwMWGdYdBKwErjhlx1MDAwN1x1MDAxNjT9ZyNxr7y44Vx1MDAwNlxyP1x1MDAxOFxmXHUwMDEz+Eu7XHUwMDExeckwXG7Si+EwgatO46Trx42463eSuJF0vcbAjdy2f9FvdKKwf1x1MDAxNpyBWV5cdTAwMDODwDvNIVxcUIazrUZcdTAwMTI2zrYg+/T6OP+zrXFeN+7dqCCzY7dcdTAwMWGvt1x1MDAwZlx1MDAwZj+eNNreXHUwMDAwmKNcdTAwMDFlc4NcdTAwMTBeXHUwMDE2wV+9V41zKJ2fnFx1MDAwNaPbMVxc7N2Zh0xxRmX3XHUwMDEzKHrL86+9OUPPXHUwMDFjKdbzOlk0Z1x1MDAwZlx1MDAxNEvCwexu9jSxTENcdTAwMTWPXHUwMDBl+1XZXHUwMDEzq15+XFyaWHxcXFrlab3VZ20zXG4hm1x0lu1cdTAwMTn3596Xvlx1MDAxYXxcdTAwMWTcXHUwMDBlgn4vOvxcdTAwMTa92606artejEtz++eNh1x1MDAxZlx1MDAxOJ7udFBJu485dUOCjudaXHUwMDFizTjaJaHIuyXnXHUwMDFhQoTDIFx1MDAwNlvHfsgvhXiPh62WKfGTXHUwMDEyUOGl6zi3sFxuiGRBXHUwMDE3kjk0myC2Qlx1MDAxZtLBdnd41O+dusODve4lOfZ+XHUwMDFjfEjqj0QlM/vijvuQzJaoXHUwMDA0XHSqxnq7XHUwMDEyio86s9Bsb6E11Vx1MDAxY5SmmdtqXHUwMDAzRVx1MDAwNimkftazsp9cdTAwMWGJu67fy1jLUyCx8NJNXCKRk1x1MDAwNYuVzWExglL7hSxfrzC+v4vvjv6UO0efXHUwMDBlffrmbvuq/kjU3OHF40MxYvPbaK03XHUwMDA0gYDSoVRjXFzZxTG3wmi6XHK62bSE0XXMLXpcdTAwMDRcdTAwMDKhuFx1MDAwZppE9CBcdTAwMDSegFqMXHUwMDAwXHUwMDEwRn9cdTAwMGXcXHUwMDA0tGdcdTAwMDCicdBcdTAwMDOkJV6qJSfK2O3N9PPZ1uUwNprWbbfHctZz47tUxYLMjbthlDRbftRcdTAwMWH6RoY6jeNcdTAwMWI/aXXNo3Db5Ho2geHZ1lmQgOC9atyA9TbcYVx1MDAxMvbdXHUwMDE06CBn4yt/0PBuvdYw1eYg2812Klx1MDAxMejbiUiOXHUwMDFi51x1MDAxMWSb5mxcblx1MDAwYpl6RrHHw17SXHUwMDAwi3JNa09eajKF1G7c6Fx1MDAxOEJcdTAwMThcdTAwMGJ752np51eNz9e4XHUwMDE19zL6IO5VXFzlr07PRuKmi5CtMDX9gFx1MDAwNlx1MDAwN4c337uDbz+uep3t6+v4/ODmXHUwMDA1UK9cdTAwMDZcdTAwMWHMdcOkaSnWjs6dT7FeXHUwMDA2Jlx1MDAxYfSXMqthZcVRgLhs4IxcdTAwMTFudp56xnPWn1pcdTAwMDVcdTAwMTlGaPudjlx1MDAxN3lgnYDKpDvrODDQXHUwMDFl9tqNc6/hXfttKP1cdTAwMWYjZI1v+zE8XHUwMDBipVx1MDAwMXC9Ofk46kOYgbXRXHUwMDA16Fx1MDAwMVx1MDAxNsf9XHUwMDAwr6a3zoL0NX7yXG6yhUyHKfr7w1x1MDAwNJhcdTAwMDCQba7DW1x1MDAwMmCoOFx1MDAxZV1ouL1wxiZB+u7Ze/xRx0OrXHUwMDBiLOg03lx1MDAwMtzuXHUwMDFhQG6Rfz5cdTAwMDRWM70oo7zD4CxcdTAwMTiEXHS80Vx1MDAxZr0xZUCT6/bh98pcZs+CtP+mjFx1MDAxONNuXHUwMDBmP4lcdTAwMWLhzaTPZpZnrjb+q9GGj+2FXHUwMDAzb1oxXmA24IJXuYnpVpl7+J/xuLfHVFx1MDAxNfBkXHUwMDA3qqDky+Gx0Vsj7+fQj0b2ZTp1Rk1cdTAwMTSFvVx1MDAwNryh40LDQlNtN1x1MDAwZT6eNI4/bFx1MDAxZlx1MDAxY7z97DS2oV785J/xiMuhOH5w6ZnGcdvuXHUwMDAw3lx1MDAxME8q3XQxTb7YXHUwMDBm4sRz24ab+yHYzd2EimdWkLatuVx1MDAxNPnxlXnwPPJGXHUwMDFkT7mcXHUwMDFhw0Hktf1W4p73vLPA5JB2ij2DT/yFgF9cYqgnXHUwMDAy7OLDSZ/pb+NcdTAwMDGwLXcwOIZcdTAwMDY3N0eSXHUwMDA1PJnfXHUwMDFle4dcdTAwMTlcdTAwMWO2rn3vZqfEs3bSnznjK1x1MDAxNT5GYqQ7XHUwMDA1/vvv3/7+P5F5iEQifQ==<!-- payload-end -->
+  <!-- payload-type:application/vnd.excalidraw+json --><!-- payload-version:2 --><!-- payload-start 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<!-- payload-end -->
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diff --git a/narration/images/railway_input_output.png b/narration/images/railway_input_output.png
index 86f4318..367b746 100644
Binary files a/narration/images/railway_input_output.png and b/narration/images/railway_input_output.png differ