optimum speedoptimum structural designoptimum velocityoptimum water contentoptional trafficordinary buildingordinary clayordinary limeordinary portland cementordinary red brickoreorganic materialorganic soilorganismoriel windoworientationoriented sampleorificeorifice diameteroriginorigin and destination of triporigin and destination studiesoriginal areaoriginal cross sectionoriginal groundoriginal ground leveloriginal maporiginal planoriginal speedoriginal structureoriginal velocityorographic precipitationorthoclaseorthogonalorthogonal matrixorthogonal mesh reinforce mentsorthogonal projectionorthogonal trajectoriesorthogonalizationorthophoto maporthophoto mosaicorthoscopyorthotropicoscillateoscillatingoscillating flowoscillating jetoscillating jumposcillating lubricatoroscillation
