#-------------------------------------------------------------
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
#
#-------------------------------------------------------------

cond = $1
R = as.matrix(list(0,0,0,-1));

# empty list construction
L = list();
if( cond & sum(R) > 0 )
  L = list(R, R);
R[1,] = length(L);

# list append
for(i in 1:7)
  L = append(L, as.matrix(i))
R[2,] = length(L);

# list remove
for(i in 1:4) {
  [L,x] = remove(L, 2);
	print(toString(as.matrix(x))); 
}
R[3,] = length(L);

write(R, $2);