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def is_subsequence(s, t):
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"""
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:type s: str
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:type t: str
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:rtype: bool
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"""
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if len(s) > len(t):
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return False
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matched_s = 0
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for char in t:
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if matched_s < len(s) and s[matched_s] == char:
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matched_s += 1
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return matched_s == len(s)
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