Different clues can establish both the presence of an omission and its likely content.
ClueExampleRecovered point
Reason and usageWa-sʾal al-qaryahAsk its people
Earlier actionKulla safīnahA usable ship
Conditional syntaxWa-law tarāAn unspoken consequence
Story sequenceFa-arsilūn … YūsufIntermediate events
Starting an actionBi-smi llāhThe relevant verb
Social conventionBi-r-rafāʾ wa-l-banīnThe implied occasion
Each form of evidence has its own scope; no single inference rule applies mechanically to all instances.