Replace "for a single" by "for one" where appropriate
The phrase "for a single [entity] ..." in the sense of "one [entity] per element" may be ambiguous. Therefore the phrase is replaced by "for one [entity] ...".
The phrase "for a single [entity] ..." in the sense of "one [entity] per element" may be ambiguous. Therefore the phrase is replaced by "for one [entity] ...".