4.
已知集合\(A=\left\{a,b,c\right\},B=\left\{ \left.x \right|1\leqslant x\leqslant 9且x∈N\right\} \)若映射\(f:A→B \)满足\(f\left(a\right)\leqslant f\left(b\right)\leqslant f\left(c\right) \)且\(f\left(a\right)+f\left(b\right)+f\left(c\right)=12 \),则这样的映射个数为\((\) \()\)