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for (Entry entry : commands.entrySet()) {
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    if (entry.getValue().equals("lol")) {
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    if (myString.contains(entry.getKey())) {
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        //Do stuff here
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        myString.replace(entry.getKey(), entry.getValue());
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        //Other magic
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    }
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}
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//OR, if you don't need any other magic:
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for (Entry entry : commands.entrySet()) {
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    myString.replace(entry.getKey(), entry.getValue());
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}