Assertion: muscular dystrophy's symptom | /r/HasProperty | inability
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Source sentences:
text: Early symptoms, which usually occur between the ages of two and six, include a waddling gait, frequent falling, difficulty in getting up from a lying or sitting position, enlargement of the calf muscles, inability to raise the knees, and disappearance of a normal knee or ankle jerk; symptoms become more obvious as the child ages.