A flip of a fair coin is used to simulate the sizes of a series of simulated shirts. 
Given the following six flips, how many extra-large shirts were there?
H T T T H T
Definitions:
Strength
The quality or state of being physically strong.
Flexibility
The quality of bending easily without breaking, often referring to the range of motion available in a muscle or joint.
Swing-Through Gait
A type of gait where an individual uses crutches to lift and move both legs simultaneously forward through the crutches for mobility.
Crutches
Mobility aids consisting of two long sticks with crosspieces for a person to place under their arms and use for support while walking.
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