Software: PowerPoint (Office)
User query: Insert a text box, type 'MONA LISA,' set the font size to 138, and set the font to Arial Black
Difficulty: medium
Ground-truth plan:
Task 1: Insert a text box, type 'MONA LISA' 
Subtask 1: Go to 'Insert'
Subtask 2: Click on 'Text Box'
Subtask 3: Center align the text
Subtask 4: Type 'MONA LISA'
Subtask 5: Align the text to the middle of the silde
Subtask 6: Increase the font size to 138
Subtask 7: Change the font to 'Arial Black'