I see it in
//----------------------------------------------------------------
// ****** DYNAMIC DELAY RANGE ##[d1:d2] **********
// Implements ##[d1:d2] ##0 a_sequence
// for use in consequent
// Application: $rose(a) |-> dynamic_delay_lohi_sq(d1, d2, q) ;
sequence dynamic_delay_lohi_sq(d1, d2, sq);
int v1, vdiff;
( (1, v1=d1, vdiff=d2-d1) ##0 dynamic_delay(v1) ##0
(vdiff>=0, vdiff=vdiff - 1)[*1:$] ##0 sq);
endsequence