abs a 200 400 -30
extend a b len 200mm
extend b c ang 120 -450
extend c d len 150mm
extend d e parallel a -315
extend e f upto a

rel a a0 0 37 0
extend a0 b0 upto b
extend b0 c0 upto c -487
extend c0 d0 upto d
extend d0 e0 upto e -352
extend e0 f0 upto f

extend a b1 ang 22.5 -228
extend b1 c1 uptoang 60 -228
extend c1 d1 upto f
extend d1 e1 len 100

abs j 200 600 27
extend -j je len 50

join f -j arcs