}
if (level >= 0)
cs[cs.length-1].set0(r, level);
else
cs[cs.length-1].setNA0(r);
}
}
if (level == -1) {
level = _fr.lastVec().domain().length-1;
assert _fr.lastVec().domain()[level] == _other;
}
cs[cs.length - 1].set0(r, level);
}
}