| #### 7.10.6.3 ncVarsAdd Procedure from library `ncrat.lib` (see ncrat_lib). Usage: ncVarsAdd(vars); list vars contains variables Returns: sets list elements as nc variables Example:
    LIB "ncrat.lib";
    ncInit(list("x", "y", "z"));
    ncVarsGet();
    ==> x,y,z
    ncVarsAdd(list("a", "b", "c"));
    ==> // ** killing the basering for level 0
    ncVarsGet();
    ==> x,y,z,a,b,c

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