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#!/bin/bash
# words filter 过滤文本中每一行的单词,忽略句子

do_filter() {
  while read -r line || [ -n "$line" ]; do
    words_count=$(echo $line | wc -w)
    if [[ $words_count -eq 1 ]]; then
      echo $line
      echo $line >> $output
    fi

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Classfile Dog.class
  Last modified Jul 25, 2021; size 292 bytes
  MD5 checksum 0a3fc7839e461000cf02f189aad9a1cc
  Compiled from "Dog.java"
public class org.wiyi.bridge.Dog extends org.wiyi.bridge.Animal
  minor version: 0
  major version: 46
  flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: #2                          // org/wiyi/bridge/Dog
  super_class: #4                         // org/wiyi/bridge/Animal

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public class GeoHashHelper {
    private static final double MAX_LAT = 90;
    private static final double MIN_LAT = -90;
    private static final double MAX_LNG = 180;
    private static final double MIN_LNG = -180;
    private static final int length = 20;
    private static final double latUnit = (MAX_LAT - MIN_LAT) / (1 << 20);
    private static final double lngUnit = (MAX_LNG - MIN_LNG) / (1 << 20);
    private static final String[] base32Lookup =
            {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "b", "c", "d", "e", "f", "g", "h",