public void Remove(Statement statement) { if (statement.AnyNull) { for (int i = 0; i < statements.Count; i++) { Statement s = (Statement)statements[i]; if (statement.Matches(s)) { statements.RemoveAt(i); i--; if (isIndexed) { GetIndexArray(statementsAboutSubject, s.Subject).Remove(s); GetIndexArray(statementsAboutObject, s.Object).Remove(s); } } } } else { statements.Remove(statement); if (isIndexed) { GetIndexArray(statementsAboutSubject, statement.Subject).Remove(statement); GetIndexArray(statementsAboutObject, statement.Object).Remove(statement); } } }