Mu mirongo igezweho yo gupakira-yaba gupfunyika ibiryo cyangwa imiti ifunga imiti-kwiringirwa ntabwo biganirwaho. Imashini ziri inyuma yiyi mirimo zikora vuba, zishyushye, kandi munsi yinyeganyeza. Kugirango ibintu byose bigende neza, injeniyeri yishingikiriza kumutwe wumutwe kugirango uhuze imbaraga zidasanzwe, neza, hamwe nubushobozi bwumwanya.