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.\"O At program startup, three text streams are predefined and need not be
-.\"O opened explicitly \(em
+.\"O opened explicitly:
.\"O .I standard input
-.\"O (for reading conventional input), \(em
+.\"O (for reading conventional input),
.\"O .I standard output
.\"O (for writing conventional input), and
.\"O .I standard error
.\"O (for writing diagnostic output).
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.I ɸ½à½ÐÎÏ (standard output)
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.I ɸ½à¥¨¥é¡¼½ÐÎÏ (standard error)