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I think the answer is called ripple marks
Any answer to this requires viewing the marks. Have your son seen by a physician, Physician's Assistant, or a Nurse.
A small flute
None of them.
OMR technology
Graduations or Graduation Marks.....
An angiokeratoma is a benign lesion of capillaries, resulting in small marks and characterized by hyperkeratosis.
the timing marks are on the top of the gearbox,near the engine,under a small cover or grommet. MICK [THEY ARE ON THE THE FLYWHEEL?]NEAR THE "TEETH"
The sample size is likely to be too small.
A depression is shown by contour lines with small marks pointing toward the lowest point of the depression.
tick marks
Bullets :)