Labels:bulletin board | lepton | person | sky | surfboard OCR: 4.4,2 Tet's follow che progress, as tine marehes r>t PUiRCGTE section the thick surface ro linte- segment al first shull sOn sOc, it is actual]v sfick line- segment. 1irst i1 extends backwards away from uS curving t the len and around encle AL the time widcas and falds over Eventually reaches doublc its original width folling the ewer, and cormes back the Poincare section padeqs-n u follou PUinCrr appar cwer vecuion shapcc chaonc