pombo experimental gismu

x1 is unique in property x2 among x3; x1 is the only thing/all of the things that satisfy x2 in set x3

See also po'o, olkai, pavdzakai. Proposed rafsi -pom-

In notes:

pavdu'i
x1=d1=d2 is unique in property / dimension / quantity / aspect x2=d3 among x3; x1 is the only / sole x2 [property] among x3.