public void setReadonly(boolean readonly) {
		this.readonly = readonly;
		configLookup = null; // can't mod, no need for lookup cache
	}
Gets the complete set of represented alternatives for the configuration
set.

@return the set of represented alternatives in this configuration set

@since 4.3
runtime/Java/src/org/antlr/v4/runtime/atn/ATNConfigSet.java