~ひょうしに(~拍子に)   => the moment [A], unintentionally / inadvertently caused something to happen N1
ひとり ... だけでなく => not only…, not just… N2
Add
ひとり ... のみならず => not only…, not just… N2
Add
ひととおりではない => Not as usual (is okay) N2
Emphasis on degree
ひとつ => A little N3
Repetition, habit
ひととおりの.... => in the same way as; in the way; as (like everyone else) N2
Standard
もうひとつ…ない => (not) anymore N2
Description
... ひとつ…ない => nothing/not at all… N2
Emphasize the negative meaning
…ひとつも…ない => cannot possibly be ~ N2
Evaluate
ひとつまちがえば => Just (negligence) N3
Ability
…ときたひには => when it comes to N2
Story topic
なにひとつ~ない => nothing/not at all… N3
Invariant