Add chapters

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diff --git a/src/content/chapter2_flow_control/lesson06_multiple_subjects/code.gleam b/src/content/chapter2_flow_control/lesson06_multiple_subjects/code.gleam
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+++ b/src/content/chapter2_flow_control/lesson06_multiple_subjects/code.gleam
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+import gleam/io
+import gleam/int
+
+pub fn main() {
+  let x = int.random(2)
+  let y = int.random(2)
+  io.debug(x)
+  io.debug(y)
+
+  let result = case x, y {
+    0, 0 -> "Both are zero"
+    0, _ -> "First is zero"
+    _, 0 -> "Second is zero"
+    _, _ -> "Neither are zero"
+  }
+  io.debug(result)
+}
diff --git a/src/content/chapter2_flow_control/lesson06_multiple_subjects/text.html b/src/content/chapter2_flow_control/lesson06_multiple_subjects/text.html
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+<p>
+  Sometimes it is useful to pattern match on multiple values at the same time in
+  one case experession.
+</p>
+<p>
+  To do this you can give multiple subjects and multiple patterns, separated
+  commas.
+</p>
+<p>
+  When matching on multiple subjects there must be the same number of patterns
+  as there are subjects. Try removing one of the <code>_,</code> sub-patterns to
+  see the compile time error that is returned.
+</p>