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public interface WebFlowScope {
static final Map scopeMap = new HashMap();
Object getAttribute(Object key);
default public Object put(Object key, Object val) {
scopeMap.put(key, val);
return getAttribute(key);
default Map getScope() {
return scopeMap;
static final WebFlowScope scope = (Object key) -> "edited_" + scope.getScope().get(key);
assert scope.put("attribute", "val") == "val";
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