collocation | frequency |
---|---|
langley research | 7 |
research center | 7 |
billion years | 6 |
nasa langley | 4 |
planet mars | 2 |
nasa headquarters | 2 |
red planet | 2 |
land area | 2 |
olympus mons | 2 |
highly magnetized | 2 |
early history | 2 |
fast flowing | 2 |
flowing water | 2 |
ancient ocean | 2 |
living systems | 2 |
northern hemisphere | 2 |
southern hemisphere | 2 |
scale model | 2 |
collocation | frequency |
---|---|
langley research center | 6 |
nasa langley research | 4 |
fast flowing water | 2 |
collocation | frequency |
---|---|
nasa langley research center | 4 |