81.  As John remarks, a healthy, biologically balanced environment should require minimal maintenance and effort.

82.  As processes improve, it cuts out much of the wasted effort and rework, thus enhancing productivity.

83.  As Rostov watched, he seemed to make a deliberate effort to compose himself.

84.  As the number of blacks increased alarmingly in the colonies, some southern colonists made efforts to control the slave trade.

85.  At each Juncture, there is a breakdown in attention because the work requires sustained conscious effort.

86.  At first simply managing to grab the feet will prove to be an effort.