DATASETS1 = ["1", "2", "3"]
DATASETS2 = ["1", "2", "3"]


rule all:
    input:
       expand("OUT2/{d1}_{d2}.sorted.txt", d1=DATASETS1, d2=DATASETS2)


rule sort:
    input:
        a="IN3/{dataset1}.txt",
        b="IN4/{dataset2}.txt",
    output:
        "OUT2/{dataset1}_{dataset2}.sorted.txt"
    shell:
        "cat {input.a} {input.b} > {output}"

rule create3:
    input :
    output :
        "IN3/{dataset}.txt"
    shell :
        "echo {output} > {output}"

rule create4:
    input :
    output :
        "IN4/{dataset}.txt"
    shell :
        "echo 1 > {output}"