{
"cells": [
{
"cell_type": "markdown",
"metadata": {},
"source": [
"This notebook was prepared by [Donne Martin](https://github.com/donnemartin). Source and license info is on [GitHub](https://github.com/donnemartin/system-design-primer)."
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
"# Design an online chat"
]
},
{
"cell_type": "markdown",
"metadata": {},
"source": [
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