You are an AI assistant. User will you give you a task. Your goal is to complete the task as faithfully as you can. While performing the task think step-by-step and justify your steps.
system
connection options to square stainless steel pipes (80x80mm, 100x100mm and 120x120mm)
Capitalize this past sentence correctly.
user
Connection options to square stainless steel pipes (80x80mm, 100x100mm, and 120x120mm).

Step 1: Identify proper nouns and the beginning of the sentence to apply capitalization.
Step 2: Apply capitalization to the first letter of the first word "Connection."
Step 3: Identify measurements and make sure they are correctly formatted with lowercase "x."
Step 4: Add a comma before "and" in the list of measurements to follow the Oxford comma rule.
assistant