diff --git a/preprocess.sh b/preprocess.sh
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+++ b/preprocess.sh
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+#!/bin/sh
+
+# Directories
+#############
+
+mkdir -p ./{output,subword,vocab}
+
+# Tokenization
+##############
+
+for source in ./data/*/*.en; do
+	output=$(dirname $source)/$(basename $source .en)_tok.en
+	perl tokenizer.perl -l en -lc < $source > $output
+	truncate -s -1 $output
+done
+
+for target in ./data/*/*.fr; do
+	output=$(dirname $target)/$(basename $target .fr)_tok.fr
+	perl tokenizer.perl -l fr -lc < $target > $output
+	truncate -s -1 $output
+done
+
+# Subword segmentation
+######################
+
+spm_train \
+	--input=./data/{books,europarl,globalvoices,jv,news,parallel,serval,septimus,synthetic,ted}/trn_tok.en \
+	--model_prefix=./subword/septimus_en \
+	--vocab_size=16000 \
+	--character_coverage=1.0 \
+	--model_type=unigram
+
+spm_train \
+	--input=./data/{books,europarl,globalvoices,jv,news,parallel,serval,septimus,synthetic,ted}/trn_tok.fr \
+	--model_prefix=./subword/septimus_fr \
+	--vocab_size=16000 \
+	--character_coverage=1.0 \
+	--model_type=unigram
+
+spm_encode \
+	--model=./subword/septimus_en.model \
+	--output_format=piece \
+	< ./data/septimus/tra_tok.en \
+	> ./data/septimus/tra_sub.en
+
+truncate -s -1 ./data/septimus/tra_sub.en
+
+# Building vocab
+################
+
+onmt_build_vocab --config configs/transformer_tuned.yaml --n_sample -1
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