java.lang.NumberFormatException: For input string: "2 3"

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java.lang.NumberFormatException: For input string: "2 3"
at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
at sun.misc.FloatingDecimal.parseDouble(Unknown Source)
at java.lang.Double.parseDouble(Unknown Source)
at homeworkcsc201.Frequency.main(Frequency.java:26)

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