I. [v73-179] dashes (5 mm) drawn starting from a random place and random direction with random selected colour (18 colours); coloured pencil with graphite pencil on paper

not numbered [v73-200] horizontal and vertical lines, forming a 4 × 4 cm grid, drawn with random choice of colour; coloured pencil with graphite pencil on paper

II. [v73-213] inside an area with random size (3-10 cm) and place with 5 × 5 mm grid, elements on the gridlines are distributed with at random selected number, position (horizontal/vertical) and length; black ink with graphite pencil on paper

III. [v73-214] horizontal and vertical lines are drawn at a distance of 2 cm [→ 2 × 2 cm grid] with at random choice to draw a line or not (both lines 1-3 cm) from left to righ and top to bottom; black ink with graphite pencil on paper

IV. [v73-215] inside the squares of a 2 × 2 cm grid, lines are drawn connecting with random choice top left to bottom right or top right to bottom left; black ink with graphite pencil on paper

V. [v73-216] horizontal and vertical lines are drawn at a distance of 2 cm [→ 2 × 2 cm grid]; black ink with graphite pencil on paper

VI. [v73-217] lines are drawn with at random selected distances from one side to the other, horizontal and vertical [program as v73-197 (sketchbook XVI/ X)]; black ink with graphite pencil on paper

VII. [v73-218] the lines of v73-197 are used as guides to connect inside each square lines with random choice from top left to bottom right or top right to bottom left [program as v73-198 (sketchbook XVI/ XI)]; black ink with graphite pencil on paper

VIII. [v73-219] dots with random selected size (size 1-5) distributed at random on the columns following a random scheme; black ink with graphite pencil on paper

IX. [v73-220] vertical lines drawn at a distance of 5 mm with at random choice of line thickness (0.2, 0.4, 0.8, 1.2 mm); black ink with graphite pencil on paper

X. [v73-221] horizontal and vertical lines drawn at a distance of 5 mm (5 × 5 mm grid); the first line starts with random line thickness (0.2, 0.4, 0.8, 1.2 mm), the following line is less in case of even numbers and if odd more thickness; black ink with graphite pencil on paper

XI. [v73-222] horizontal and vertical lines drawn at a distance of 5 mm (5 × 5 mm grid) with at random choice of colour (black or yellow); coloured ink with graphite pencil on paper

XII. [v73-223] horizontal and vertical lines drawn at a distance of 1 cm (1 × 1 cm grid) with at random choice of colour (yellow or black) [program as v73-222]; coloured ink with graphite pencil on paper

XIII. [v73-224] horizontal and vertical lines drawn at a distance of 2 cm (2 × 2 cm grid) with at random choice of colour (black or yellow) [program as v73-222]; coloured ink with graphite pencil on paper

XIV. [v73-226] horizontal and vertical lines drawn at a distance of 4 cm (4 × 4 cm grid) with at random choice colour (black or blue) [program as v73-222]; coloured ink with graphite pencil on paper

XV. [v73-230] horizontal and vertical lines at a distance of 3 mm (3 × 3 mm grid) with colour randomly selected starting with 1 line with randomly selected colour and the following lines left or right from the colour range (18 colours); coloured pencil with graphite pencil on paper

XVI. [v73-231] horizontal and vertical lines drawn at a distance of 5 mm in groups with random number of lines (2-9) and the same colour for each group, randomly selected (blue, red and yellow); coloured ink with graphite pencil on paper

XVII. [v73-232] vertical lines drawn at a distance of 5 mm with 1 line left out at random [program as v73-203 (sketchbook XVI/ XIV)]; black ink with graphite pencil on paper

XVIII. [v73-225] horizontal and vertical lines drawn at a distance of 2 cm (2 × 2 cm grid) with random choice of colour (black or yellow) [program as v73-222]; coloured ink with graphite pencil on paper

XIX. [v73-233] groups of horizontal and vertical lines drawn at a distance of 1 cm with at random selected thickness of the line (0.2 - 0.4 - 0.8 - 1.2 mm) [program as v73-208 (sketchbook XVI/ XIX)]; black ink with graphite pencil on paper