#!/usr/bin/env bash
# Create sequences/<train|val>/<LETTER>/ for the given letters.
# Example: ./make_seq_dirs.sh A B J Z

set -euo pipefail

if [ "$#" -lt 1 ]; then
  echo "Usage: $0 LETTER [LETTER ...]   e.g.  $0 A B J Z"
  exit 1
fi

ROOT="sequences"
for SPLIT in train val; do
  for L in "$@"; do
    mkdir -p "$ROOT/$SPLIT/$L"
  done
done

echo "✅ Created $ROOT/train and $ROOT/val for: $*"