define "ldragon [[ :size :level][if :level = 0 then fd :size stop][ldragon :size :level - 1][left 90][rdragon :size :level - 1]] define "rdragon [[ :size :level ][if :level = 0 then fd :size stop][ldragon :size :level - 1][right 90][rdragon :size :level - 1]] define "dragon [[ :size :level][ldragon :size :level]] top][ldragon :size :level - 1][right 90][rdragon :size