Non-regular Lagrangian concordances between Lagrangian fillable Legendrian knots

In this short note, we construct a family of non-regular, and therefore non-decomposable, Lagrangian concordances between Lagrangian fillable Legendrian knots in the standard contact 3 3 -dimensional sphere. More precisely, for every decomposable Lagrangian concordance from Λ − \Lambda _- to Λ + \Lambda _+ , where Λ ± \Lambda _{\pm } are smoothly non-isotopic Legendrian knots, we construct a non-regular Lagrangian concordance from Λ + ′ \Lambda ’_+ to Λ − ′ \Lambda ’_- , where both Λ ± ′ \Lambda ’_\pm are Lagrangian fillable Legendrian knots obtained from Λ ± \Lambda _{\pm } by sufficiently many positive and negative stabilisations, followed by a sequence of Legendrian satellite operations.