'PROCEDURE' ELPER.,
'BEGIN' JI1.=JS1., JI2.=JS5.,
        ELIRR
'END' ELPER.,

'BEGIN' 'COMMENT' TEXTUR
MIT ELPER.,
N.=20.,
JLI.=-10., JRE.=30.,
JUN.=-10., JOB.=30.,
T.=0.,
SERIE(20.0,20.0,8,6,ELPER).,
T.=1.,
SERIE(20.0,20.0,8,6,ELPER).,
'END'.,

'COMMENT' T=0 fig. 47, T=1 fig. 48.

function ELPER() {
  JI1 = JS1; JI2 = JS5;
  ELIRR();
}
N = 20; T = 0;
JLI = -10; JRE = 30;
JUN = -10; JOB = 30;
SERIE(20, 20, 6, 8, ELPER);
// Plate: chimneys on top, 6×8. Listing 8,6.

Approximate rendering. Section 3.2.10: the texture of figures 29/30 becomes an ornament when ELIRR is reloaded with JS1 and JS5 at every call (ELPER). The walks are congruent; overlapping frames make the repeat. T = 0 stays axis-parallel. Sheet in plotter pose (+Y up) so the six chimneys sit on top as in the scan; 6 × 8 cells. The plate is a closed rectangle — side and bottom overhangs are cropped, the chimneys are the top edge. The listing says SERIE(20,20,8,6) — the 90° button turns to the texture pose.

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