Three-leg fully open: 100 x 55 Three-leg single open: 100 x 27
Three-foot couplet: 100 x 27
Three-foot bucket: 55 x 50
Three-foot-three-open ratio is not as good as four-foot-four-open ratio or three-open ratio. It is suggested that four feet four open or four feet three open be written with narrow stripes.