>chr1
ACCGTACCGTACCGTACCGTACCGTACCGTACCGTACCGTACCGTACCGTACCGTACCGTACCGTACCGTACCGTACCGTACCGTACCGTACCGTACCGT
>chr2
ACGTNACGTNACGTNACGTNACGTNACGTNACGTNACGTNACGTNACGTNACGTNACGTNACGTNACGTNACGTNACGTNACGTNACGTNACGTNACGTN
