rule all:
    input: "c5.txt"

rule c1:
    output: "c1.txt"
    shell: "echo 1 > {output}"
rule c2:
    input: "c1.txt"
    output: "c2.txt"
    shell: "echo 2 > {output}"
rule c3:
    input: "c2.txt"
    output: "c3.txt"
    shell: "echo 3 > {output}"
rule c4:
    input: "c3.txt"
    output: "c4.txt"
    shell: "echo 4 > {output}"
rule c5:
    input: "c4.txt"
    output: "c5.txt"
    shell: "echo 5 > {output}"
