DeepSeek V4 Flash - High (answered in 3.4s, $0.00 cost)

    Thought: Let me think about this question. The days of the week are:
    Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday.
    Now I need to count how many have the letter "d" in them:
    - Monday: has 'd' 
    - Tuesday: has 'd' 
    - Wednesday: has 'd' 
    - Thursday: has 'd'  (Thursday)
    - Friday: has 'd' 
    - Saturday: has 'd' 
    - Sunday: has 'd' 
    Wait, let me be more careful:
    - M o n d a y - has 'd' 
    - T u e s d a y - has 'd' 
    - W e d n e s d a y - has 'd' 
    - T h u r s d a y - has 'd' 
    - F r i d a y - has 'd' 
    - S a t u r d a y - has 'd' 
    - S u n d a y - has 'd' 
    All 7 days have the letter 'd' in them.
    7