| Share | Phrase |
| 22.00% | numeral [does] reference |
| 8.85% | reference to aid |
| 7.57% | reference value [perform operation] |
| 7.06% | pressure [connection] reference |
| 5.61% | generally [resume] reference |
| 5.16% | ground [connection] reference |
| 5.14% | function [reference] reference |
| 4.86% | reference modal shall |
| 4.77% | reference waveform [perform operation] |
| 4.48% | reference map [perform operation] |
| 4.04% | end [connection] reference |
| 3.46% | means [does] reference |
| 3.43% | reference pressure [perform operation] |
| 3.35% | number [does] reference |
| 2.59% | reference component [perform operation] |
| 2.27% | reference system [perform operation] |
| 1.88% | reference assembly [perform operation] |
| 1.73% | reference part [perform operation] |
| 0.90% | reference modal may |
| 0.75% | not reference |