eric reference to several disks (or pegs ?): disk b could
refer to diisks 1 et 2, and disk c to disks 3 and 4
- or from an integration of several disks : the pink yellow disk which is
refering to the set disk 1 or disk 3, and which can refers either to solid
disk 1 or to solid disk 3

(c ) a detached disk can belong either to enunciative space as selected disk
(criterium = anaphora, for example : 'the yellow disk I put it on column
b'),  or at situational level (if no anaphora). Furthermore an orthogonal
sp