Compare the three examples side by side:
VerbMiddle letterVowelPattern
ضَرَبَرَFathahفَعَلَ
سَمِعَمِKasrahفَعِلَ
كَرُمَرُDhammahفَعُلَ
The words are different, but the method of recognizing the pattern is the same.
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One More Comparison
Foundations of the Past Tense Verb (Fi'l Maadhi)
Compare the three examples side by side:
VerbMiddle letterVowelPattern
ضَرَبَرَFathahفَعَلَ
سَمِعَمِKasrahفَعِلَ
كَرُمَرُDhammahفَعُلَ
The words are different, but the method of recognizing the pattern is the same.