Problem:
Return true if the given string begins with "mix", except the 'm' can be anything, so "pix", "9ix" .. all count.
mixStart("mix snacks") → true
mixStart("pix snacks") → true
mixStart("piz snacks") → false

Solution:
public boolean mixStart(String str) {
if (str.startsWith("ix", 1))
return true;
else
return false;
}
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