なくて済む/ないで済む => get by without doing ~ N2
を[経「へ」]て => After A N1
Time, Situation
~をたて(~を経て)      => through; after; via N1
ずに済む => get by without doing ~ N2
一緒に => together N5
て済む => sufficient by; no problem to; resolve by ~ N3
一度に => all at once N3
一通り => Basically, (get) over, done N2
Base, base
一方だ => more and more; continue to ~ N2
一応 => more or less; pretty much; roughly; tentatively ~ N2
一体 => …the heck; …in the world; …on earth N3
一方 => on one hand, on the other hand; although ~ (conjunction) N2