user: Question: What is the average Pick, when Name is "lybrant robinson", and when Overall is less than 139?
Columns: ['Round', 'Pick', 'Overall', 'Name', 'Position', 'College']
Types: ['real', 'real', 'real', 'text', 'text', 'text']
Sample row: [3.0, 10.0, 66.0, 'Tracy Rocker', 'DT', 'Auburn']
SQL:

assistant: SELECT AVG("Pick") FROM "Table" WHERE "Name" = 'lybrant robinson' AND "Overall" < 139.0;