script.sh

#!/bin/bash

set -eu

x=(333,343,353,363)
y=(0.025,0.05,0.1,0.2)
z=(a,b,c,d,e,f)

IFS=','


for xelement in $x; do
  for yelement in $y; do
    for zelement in $z; do
      touch ${xelement}_${yelement}_${zelement}
    done
  done
done