diff --git a/planning.md b/planning.md
index 40d428a..d1f5586 100644
--- a/planning.md
+++ b/planning.md
@@ -38,18 +38,40 @@ return digit_names[number]
 If the integer is under 10, then use the procedure described above. 
 Otherwise, ... (this is where you take over!)
 
-## Integers under 100
+under_20 = [
+    "ten", "eleven", "twelve", "thirteen", "fourteen",
+    "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"
+]
 
+return under_20[number-10]
+
+## Integers under 100
+tens = [
+    "twenty", "thirty", "fourty", "fifty", "sixty",
+    "seventy", "eighty", "ninety"
+]
+
+return tens[tens_digit] + digit_names[ones_digit] # assuming 1's digit is > 0
 
 ## Integers under 1000
 
+return digit_names[hundreds_digit] + " hundred " + tens[tens_digit] + digit_names[ones_digit]
+
 
 ## Integers under 1000000
-
+return digit_names[thousands_digit] + " thousand " + digit_names[hundreds_digit] + " hundred " + tens[tens_digit] + digit_names[ones_digit]
 
 ## Negative integers down to -1 million
 We won't deal with negative integers in this problem set, 
 but how would you deal with a negative integer, using the 
 functions above?
 
+Convert number to string, check if first character is '-'
+All of the digit indices will depend on the length of the str and whether str[0] is -
+
+if number[0] == '-':
+    return "negative " + digit_names[thousands_digit] + " thousand " + digit_names[hundreds_digit] + " hundred " + tens[tens_digit] + digit_names[ones_digit]
+else:
+    return digit_names[thousands_digit] + " thousand " + digit_names[hundreds_digit] + " hundred " + tens[tens_digit] + digit_names[ones_digit]
+