如何在Snakemake中配置多个目录，子目录？

wildcard_constraints:
    dir1 = "A|B"
    dir2 = "C|D"

wildcard_constraints:
    dir1 = "A|B"
    dir2 = "C|D"

rule process_A_C:
    input:
        directory = "path/to/{dir1}/{dir2}"
    output:
        "output/{dir1}/{dir2}/result.txt"
    shell:
        "command_to_process {input.directory} > {output}"

rule all:
    input:
        expand("output/{dir1}/{dir2}/result.txt", dir1=wildcards.dir1, dir2=wildcards.dir2)