Rollers prepare optimal seedbeds by making them as flat as is practical and moderately firmed. The soil is then gently firmed around the roots, so holding the plant steady. The original estimates were firmed up to 84 MEPs, then to approximately 60. In January 2019, Breeze firmed up its order for the A220 aircraft. On 8 April 2019, Uganda National Airlines Company firmed up its order for two -800s. By the time recreational marijuana was legal in Canada, Manitoba had firmed up its rules. Touch screen navigation is standard and the suspension has been firmed up. By April Basehard and Douglas had firmed as the leads. On March 2, 2015, Interjet firmed ten SSJ100 options valued at $350 million. By now the specifications were being firmed. For the first time, USAC firmed up the rules regarding pole day qualifying. In , the airline firmed up an order for Boeing 777-300ER aircraft plus options. On 8 April 2019, the airline firmed up its order for two A330-800 neos. Eventually Fred MacMurray, Jane Wyman and Tommy Kirk firmed as the three leads. The implementation of the restoration work was firmed up.