我需要编写一个优化的 java(8) 程序来按给定顺序查找以下字符串的所有可能组合路径。
c1&c2-s1&s2-d1&d2&d3-j1&j2
可能的路径：
c1/s1/d1/j1
c1/s1/d1/j2
c1/s1/d2/j1
c1/s1/d2/j2
c1/s1/d3/j1
c1/s1/d3/j2
c1/s2/d1/j1
c1/s2/d1/j2
c1/s2/d2/j1
c1/s2/d2/j2
c1/s2/d3/j1
c1/s2/d3/j2
c2/s1/d1/j2
c2/s1/d2/j1
c2/s1/d2/j2
c2/s1/d3/j1
c2/s1/d3/j2
c2/s2/d1/j1
c2/s2/d1/j2
c2/s2/d2/j1
c2/s2/d2/j2
c2/s2/d3/j1
c2/s2/d3/j2
我尝试过蛮力方式（嵌套循环）来解决问题，但它会影响性能，所以寻找不同的解决方案。
任何人都可以通过优化解决方案帮助我解决这个问题吗？