partial alphanumeric_keys
xkb_symbols "arrows" {
 key <AD06> {[z, Z, NoSymbol, U21D0]};
 key <AD07> {[u, U, NoSymbol, U21D3]};
 key <AD08> {[i, I, NoSymbol, U21D2]};
 key <AD09> {[o, O, U2191, U21D1]};
};
