Word Destructor, Java

Word Destructor

//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;
import java.util.function.*;

class Rextester
{  
    public static final List<String[]> LETTERS = new ArrayList<String[]>(){{
        add(new String[]{"sh", "sch", "ch"});
        add(new String[]{"u", "uu", "uh"});
        add(new String[]{"d", "t", "dt", "th", "dd"});
        add(new String[]{"e", "ä", "eh"});
        add(new String[]{"a", "ah", "ahhhhh"});
        add(new String[]{"k", "c", "kk"});
        add(new String[]{" ", "_"});
        add(new String[]{"s", "ß", "ss"});
        add(new String[]{"o", "ou", "oo"});
        add(new String[]{"h", "'", ""});
        add(new String[]{"r", "rrr"});
        add(new String[]{"i", "ie", "ii", "ih"});
        add(new String[]{"y", "ü"});
        add(new String[]{"j", "tsch", "dsch"});
        add(new String[]{"p", "b", "pp", "bb"});
    }};
    
    
    
    public static void main(String args[])
    {
        String name = new Scanner(System.in).nextLine();
        StringBuilder sb = new StringBuilder();
        System.out.println(name);
        for(String c : name.split("")){
            sb.append(getEquivalent(c));
        }
        
        System.out.println(sb.toString());
    }
    
    public static String getEquivalent(String s){
        for(String[] sa : LETTERS){
            if(Arrays.asList(sa).contains(s.toLowerCase())){
                return sa[(int)(Math.random() * sa.length)];
            }
        }
        return s;
    }
}


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