What number comes: after:10,15,18,14,12,17,11,13,16; before: 16,13,11,17,12,14,18,15,10,19? У меня не получается решить !!! Помогите пожалуйста !!!!

after: eleven, sixteen, nineteen, fifteen, thirteen, eighteen, twelve, fourteen, seventeen before: fifteen, twelve, ten, sixteen, eleven, thirteen, seventeen, fourteen, nine, eighteen.            

after: after 10 comes eleven after 15 comes sixteen after 18 comes nineteen after 14 comes fifteen after 12 comes thirteen after 17 comes eighteen after 11comes twelve after 13 comes fourteen after 16 comes seventeen   before: before 16 comes fifteen before 13 comes twelve before 11 comes ten before 17 comes sixteen before 12 comes eleven before 14 comes thirteen before 18 comes seventeen before 15 comes fourteen before 10 comes nine before 19 comes eighteen.