~ひょうしに(~拍子に)   => the moment [A], unintentionally / inadvertently caused something to happen N1
~と(が)相まって => combining / together with… N1
Attached
に相違ない => without a doubt; certain; sure N2
に[相違「そうい」]ない => No doubt N2
Information, Report
と[相「あい」]まって => Along with A N1
Lists, examples