The London Memorandum -LRB- NUMBER@1 -RRB- gave the ethnic MISC@1 the choice of either opting to leave -LRB- the so-called optants -RRB- or staying .

The London Memorandum of NUMBER@1 gave to the ethnic MISC@1 the choice of either opting to leave -LRB- the so-called optants -RRB- or staying .
