Let ${\mathrm{x}}_1{\mathrm{x}}_2{\mathrm{x}}_3{\mathrm{x}}_4{\mathrm{x}}_5{\mathrm{x}}_4{\mathrm{x}}_3{\mathrm{x}}_2{\mathrm{x}}_1$be a nine digit palindrome such that either the sequence $\left(x_1, x_2, x_3, x_4, x_5\right)$  is a strictly ascending or strictly descending. Then the number of such palindromes is