August sync of docs to problem specs.

Author: BethanyG

exercises/practice/luhn/.docs/instructions.md

@@ -41,7 +41,7 @@ If the sum is evenly divisible by 10, the original number is valid.
 
 ### Invalid Canadian SIN
 
-The number to be checked is `066 123 468`.
+The number to be checked is `066 123 478`.
 
 We start at the end of the number and double every second digit, beginning with the second digit from the right and moving left.
 

exercises/practice/say/.docs/instructions.md

@@ -1,48 +1,12 @@
 # Instructions
 
-Given a number from 0 to 999,999,999,999, spell out that number in English.
+Given a number, your task is to express it in English words exactly as your friend should say it out loud.
+Yaʻqūb expects to use numbers from 0 up to 999,999,999,999.
 
-## Step 1
+Examples:
 
-Handle the basic case of 0 through 99.
-
-If the input to the program is `22`, then the output should be `'twenty-two'`.
-
-Your program should complain loudly if given a number outside the blessed range.
-
-Some good test cases for this program are:
-
-- 0
-- 14
-- 50
-- 98
-- -1
-- 100
-
-### Extension
-
-If you're on a Mac, shell out to Mac OS X's `say` program to talk out loud.
-If you're on Linux or Windows, eSpeakNG may be available with the command `espeak`.
-
-## Step 2
-
-Implement breaking a number up into chunks of thousands.
-
-So `1234567890` should yield a list like 1, 234, 567, and 890, while the far simpler `1000` should yield just 1 and 0.
-
-## Step 3
-
-Now handle inserting the appropriate scale word between those chunks.
-
-So `1234567890` should yield `'1 billion 234 million 567 thousand 890'`
-
-The program must also report any values that are out of range.
-It's fine to stop at "trillion".
-
-## Step 4
-
-Put it all together to get nothing but plain English.
-
-`12345` should give `twelve thousand three hundred forty-five`.
-
-The program must also report any values that are out of range.
+- 0 → zero
+- 1 → one
+- 12 → twelve
+- 123 → one hundred twenty-three
+- 1,234 → one thousand two hundred thirty-four

exercises/practice/say/.docs/introduction.md

@@ -0,0 +1,6 @@
+# Introduction
+
+Your friend Yaʻqūb works the counter at the busiest deli in town, slicing, weighing, and wrapping orders for a never-ending line of hungry customers.
+To keep things moving, each customer takes a numbered ticket when they arrive.
+
+When it’s time to call the next person, Yaʻqūb reads their number out loud, always in full English words to make sure everyone hears it clearly.

exercises/practice/triangle/.docs/instructions.md

@@ -13,6 +13,11 @@ A _scalene_ triangle has all sides of different lengths.
 
 For a shape to be a triangle at all, all sides have to be of length > 0, and the sum of the lengths of any two sides must be greater than or equal to the length of the third side.
 
+~~~~exercism/note
+We opted to not include tests for degenerate triangles (triangles that violate these rules) to keep things simpler.
+You may handle those situations if you wish to do so, or safely ignore them.
+~~~~
+
 In equations:
 
 Let `a`, `b`, and `c` be sides of the triangle.