}
String sampleId = tokens[sampleColumn].trim();
String type = tokens[typeColumn].trim();
MultiMap<String, String> attributes = new MultiMap();
int n = Math.min(headers.length, tokens.length);
for (int i = 0; i < n; i++) {
String key = headers[i];
String value = tokens[i];
if (value.length() > 0) {
attributes.put(key, value);
}
}
Mutation mut = new Mutation(sampleId, chr, start, end, type);