choosing one from among several;  multiple choice
 (if) by some chance;  by some possibility;  in the unlikely event that;  (unlikely event of) emergency;  the worst(-case scenario)
 (unlikely event of) emergency;  the worst(-case scenario); (lit.) 10000 to 1;  (if) by some chance;  by some possibility;  in the unlikely event that
 (unlikely event of) emergency;  the worst(-case scenario); (lit.) 10000 to 1;  (if) by some chance;  by some possibility;  in the unlikely event that
 identical;  same;  one and the same;  fair;  equal treatment;  without discrimination
 purity;  homogeneity;  unadorned
 solely;  entirely;  only;  or
 single;  simple;  sole;  individual;  unitary
 unification;  union;  oneness
 exclusively;  (taking) best care
 uniformity;  standardization;  standardisation
 Very sincerely yours; (arch.)  different
 choosing between two things;  two choices