flowchart TD
    L[Load all counterfaces] --> P{5 plates}
    P -->|for each plate| PR{6 probes in parallel}
    PR -->|for each probe| C{4 coupons on coupon square}
    C -->|for each coupon| T[Draw track]
    T --> RC[Rotate counterface - fresh ball per track]
    RC -->|3 tracks per coupon| T
    T --> DONE([120 coupons x 3 tracks = 360 tracks per run])