On notera, délicate attention de Thomas, que les ongles des majeur, annulaire et auriculaire ont été vernis aux couleurs de drapeau français : bleu, blanc, rouge.
Un procédé mnémotechnique de mémoriser cette règle de la main gauche, pour la force de Laplace est de se dire :
Bien Indiquer la Force
En ouvrant les doigts, naturellement dans l'ordre, en commençant par le pouce pour B, puis index pour I et enfin le majeur pour F.
Le code :
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