diff --git a/cd.sh b/cd.sh
index e50c76f..e4796f3 100644
--- a/cd.sh
+++ b/cd.sh
@@ -1,5 +1,3 @@
-#! /usr/bin/env bash
-
 CD_DNS_SERVERS=(
 '9.9.9.9'
 )
@@ -23,180 +21,77 @@ case "${CD_OS_NAME}" in
         exit 1
     ;;
 esac
-CD_STEP=0
 
-function cd_step {
-    if [ "${1}" ] ; then
-        ((CD_STEP++))
-        echo "
- ↕ ${CD_STEP} ↔ ${1}
+function split {
+    [ "${1}" ] && echo "
+${1}
 "
-    fi
 }
 
-function cd_write {
-local file="${1}"
-local text="${2}"
-    if [ "${file}" ] ; then
-        echo -n "${text}" \
-        > "${file}" \
-        || exit
-    fi
-}
+split " 1/14 set name servers"
+for server in "${CD_DNS_SERVERS[@]}" ; do
+    echo "nameserver ${server}" \
+    >> "${CD_DNS_FILE}" \
+    || exit
+done
 
-function cd_set_dns_resolving {
-local server
-local text=''
-    cd_step "${FUNCNAME}"
-    for server in "${CD_DNS_SERVERS[@]}" ; do
-        text+="nameserver ${server}
-"
-    done
-    cd_write "${CD_DNS_FILE}" "${text}"
-}
-
-function cd_set_packages_repositories {
-    cd_step "${FUNCNAME}"
-    case "${CD_OS_NAME}" in
-        'debian')
-            cd_write '/etc/apt/sources.list' "\
-deb https://deb.debian.org/debian bookworm main
-deb https://deb.debian.org/debian bookworm-backports main
-deb https://deb.debian.org/debian bookworm-updates main
-deb https://deb.debian.org/debian-security bookworm-security main
-"
-        ;;
-        *) exit 1 ;;
-    esac
-}
-
-function cd_set_packages_configuration {
-    cd_step "${FUNCNAME}"
-    case "${CD_OS_NAME}" in
-        'debian')
-            cd_write '/etc/apt/apt.conf.d/apt.conf' "\
+split " 2/14 configure package manager"
+echo -n "\
 Acquire::Check-Valid-Until True;
 APT::Get::Show-Versions True;
 APT::Install-Recommends False;
 APT::Install-Suggests False;
-Dir::Etc::SourceParts \"\";
-"
-        ;;
-        *) exit 1 ;;
-    esac
-}
+Dir::Etc::SourceParts '';
+" > '/etc/apt/apt.conf.d/apt.conf' \
+|| exit
+split " 3/14 configure package repositories"
+echo -n "\
+deb https://deb.debian.org/debian bookworm main
+deb https://deb.debian.org/debian bookworm-backports main
+deb https://deb.debian.org/debian bookworm-updates main
+deb https://deb.debian.org/debian-security bookworm-security main
+" > '/etc/apt/sources.list' \
+|| exit
 
-function cd_set_https_verification_off {
-    cd_step "${FUNCNAME}"
-    case "${CD_OS_NAME}" in
-        'debian')
-            cd_write '/etc/apt/apt.conf.d/https' "\
+split " 4/14 disable package verification"
+echo -n "\
 Acquire::https::Verify-Peer False;
-"
-        ;;
-        *) exit 1 ;;
-    esac
-}
+" > '/etc/apt/apt.conf.d/https' \
+|| exit
+split " 5/14 update package catalog"
+apt-get update \
+|| exit
+split " 6/14 install CA certificates package"
+apt-get install --yes 'ca-certificates' \
+|| exit
+split " 7/14 enable package verification"
+rm '/etc/apt/apt.conf.d/https' \
+|| exit
 
-function cd_update_packages_catalog {
-    cd_step "${FUNCNAME}"
-    case "${CD_OS_NAME}" in
-        'debian') apt-get update || exit ;;
-        *) exit 1 ;;
-    esac
-}
+split " 8/14 update package catalog"
+apt-get update \
+|| exit
+split " 9/14 upgrade packages"
+apt-get upgrade --yes \
+|| exit
 
-function cd_install_package {
-    if [ "${1}" ] ; then
-        case "${CD_OS_NAME}" in
-            'debian') apt-get install --yes "${1}" || exit ;;
-            *) exit 1 ;;
-        esac
-    fi
-}
-
-function cd_install_ca {
-    cd_step "${FUNCNAME}"
-    case "${CD_OS_NAME}" in
-        'debian') cd_install_package 'ca-certificates' ;;
-        *) exit 1 ;;
-    esac
-}
-
-function cd_install_git {
-    cd_step "${FUNCNAME}"
-    case "${CD_OS_NAME}" in
-        'debian') cd_install_package 'git' ;;
-        *) exit 1 ;;
-    esac
-}
-
-function cd_install_packages_tools {
-    cd_step "${FUNCNAME}"
-    case "${CD_OS_NAME}" in
-        'debian') cd_install_package 'apt-utils' ;;
-        *) exit 1 ;;
-    esac
-}
-
-function cd_install_python {
-    cd_step "${FUNCNAME}"
-    case "${CD_OS_NAME}" in
-        'debian') cd_install_package 'python3' ;;
-        *) exit 1 ;;
-    esac
-}
-
-function cd_set_https_verification_on {
-    cd_step "${FUNCNAME}"
-    case "${CD_OS_NAME}" in
-        'debian') rm '/etc/apt/apt.conf.d/https' ;;
-        *) exit 1 ;;
-    esac
-}
-
-function cd_upgrade_packages {
-    cd_step "${FUNCNAME}"
-    case "${CD_OS_NAME}" in
-        'debian') apt-get upgrade --yes || exit ;;
-        *) exit 1 ;;
-    esac
-}
-
-function cd_clean_packages_cache {
-    cd_step "${FUNCNAME}"
-    case "${CD_OS_NAME}" in
-        'debian') apt-get clean || exit ;;
-        *) exit 1 ;;
-    esac
-}
-
-function cd_main {
-    cd_set_dns_resolving
-    cd_set_packages_repositories
-    cd_set_packages_configuration
-    cd_set_https_verification_off
-    cd_update_packages_catalog
-    cd_install_packages_tools
-    cd_install_ca
-    cd_set_https_verification_on
-    cd_update_packages_catalog
-    cd_upgrade_packages
-    cd_install_git
-    cd_install_python
-    cd_clean_packages_cache
+split "10/14 install Git"
+apt-get install --yes 'git' \
+|| exit
 
 DIRECTORY="$(mktemp --directory)" \
 || exit
-cd_step "clone Continuous Delivery"
+split "11/14 clone Continuous Delivery"
 git clone \
 "${GITHUB_SERVER_URL}/${CD_REPOSITORY}" \
 "${DIRECTORY}" \
 || exit
 
-cd_step "bootstrap"
+split "12/14 install Python"
+apt-get install --yes 'python3' \
+|| exit
+split "13/14 clean package cache"
+apt-get clean \
+|| exit
+split "14/14 bootstrap"
 "${DIRECTORY}/bootstrap.sh"
-
-}
-
-cd_main