fcn non_continuous_subsequences(ary){
   pwerSet(ary).filter(fcn(list){(not isContinuous(list)) })
}
fcn isContinuous(ary){
   if(ary.len()<2) return(True);
   foreach n in (ary.len()-1){ if(1+ary[n]!=ary[n+1]) return(False); }
   return(True);
}
non_continuous_subsequences(T(1,2,3,4)).println();