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Oxygen can also be trapped inside the disc during manufacturing , although manufacturing improvements have reduced the likelihood of this . The reader can judge for himself or herself of the likelihood of this . We do not know the likelihood of this . It appears that staff are not resistant to teaching over this period , but only to the prospect that they may be required to do so in the future , and that the pilot scheme will increase the likelihood of this . The US , afraid that similar events could occur in other new NATO states , paradoxically underestimates the likelihood of this while overestimating and misinterpreting its significance .