~のぼる  => To increase N2
Reach level
... おぼえはない => don't remember... N3
Position, perspective
~かと思いきや => contrary to expectations; or so we thought, but ~ N1
Things do not match the prediction
や => ... or... N5
Line up, list
や否や => as soon as; the moment ~ N1
や、やいなや => As soon as A, B N1
Time, Situation
や => and; or N5
と[思「おも」]いきや => Even though A (was thought/expected), different result B N1
Contrast/Surprise
やっと => Eventually... N4
…とやら => heard that~ N2
Heard
またもや => again N3
Repetition, habit
やら~やら => A, B, ... (examples from a list) N2
Lists, Examples