import re

def process_doubles(sentence):
    # Use regex to split 'डबल' followed by numbers/words without space (e.g., "डबलवन" -> "डबल वन")
    sentence = re.sub(r'(डबल)(\S+)', r'\1 \2', sentence)
    
    tokens = sentence.split()
    result = []
    i = 0
    
    while i < len(tokens):
        if tokens[i] == "डबल":
            if i + 1 < len(tokens):
                result.append(tokens[i + 1])  # Append the next word/number
                result.append(tokens[i + 1])  # Append the next word/number again to duplicate
                i += 2  # Skip over the next word since it's already processed
            else:
                result.append(tokens[i])
                i += 1
        else:
            result.append(tokens[i])
            i += 1

    return ' '.join(result)