... 前に => Before ... N4
Relationship before and after
合う => do something together N3
... 前に => ... in front of, before N4
Relationship before and after
前に => before; in front of ~ N5
~こと請け合い => I guarantee ... N1
Happens next
を前提に => On the premise of N1
Premise
[合「あ」]う => To do A together/mutually N4
Secondary Verb
手前 => considering; before; in front of; one’s standpoint N1
場合(は) => in the event of; in the case that ~ N4
~ににあわず (に似合わず ) => ~Different from N1
Evaluate
~[前「まえ」]に => Before N/Vる(occurs/happens) N5
Time
当然だ/当たり前だ => natural; as a matter of course N2