| Share | Phrase |
|---|
| 24.53% | irregular [time periodicity] surface |
| 10.60% | irregular [time periodicity] combustion |
| 8.70% | irregular [time periodicity] condition |
| 8.59% | irregular [time periodicity] shape |
| 6.60% | irregular [time periodicity] running |
| 4.96% | irregular [time periodicity] become |
| 4.81% | irregular [time periodicity] interval |
| 4.57% | irregular [time periodicity] discharge |
| 4.21% | irregular [time periodicity] configuration |
| 3.22% | irregular [time periodicity] terrain |
| 2.93% | irregular [time periodicity] housing |
| 2.76% | irregular [time periodicity] quadrilateral |
| 2.75% | irregular [time periodicity] distribution |
| 2.71% | irregular [time periodicity] path |
| 2.18% | irregular [time periodicity] ignition |
| 2.10% | irregular [time periodicity] section |
| 1.88% | irregular [time periodicity] engine |
| 1.80% | irregular [time periodicity] fluctuation |