Prepare L12 & L13 flipped note

lectures/flipped/L12.md

@@ -1,9 +1,17 @@
 # Lecture 12 — Dependencies and Speculation
 
+## Roadmap
+
+We will talk about how to break dependencies to make some computations which
+appear to be "inherently sequential" parallelizable.
+
 ## Dependencies
 
 Talk about loop-carried and memory-carried dependencies.
 
+Maybe talk about the initial implementation of lab 2, which is an example of the
+loop-carried dependency.
+
 ## Breaking Dependencies with Speculation
 
 ### Speculative Execution for Threads

lectures/flipped/L13.md

@@ -1,16 +1,14 @@
 # Lecture 13 — Early Termination, Reduced-Resource Computation
 
-## Two basic ideas
+## Roadmap
 
-- skip some parts of work
-- intentionally reduce accuracy to speed things up
-
-Activity: think of some examples?
+We will talk about two ideas: 1) to skip some parts of work; and 2)
+intentionally reduce accuracy to speed things up.
 
 ## N-body problem
 
-Simple ideas are computing the forces in parallel and using `float` instead of
-`double`. But what if we want more?
+Simple ideas: computing the forces in parallel, using `float` instead of
+`double`, etc.
 
 ### live-coding